1.8T Tach Signal

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MotiveMag Forums Golf IV & Jetta IV DIY - MKIV RPM wire tap (for tach install, AVCR, GPS, etc) [Archived]

FaelinGLMember

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Member Since11-27-20045934 posts

Charlotte NC2000 JettaVRT, 207,000miles 407 whp399 tq

DIY - MKIV RPM wire tap (for tach install, AVCR, GPS, etc) « » 4:53 PM 7-30-2006

Ok, I know a lot of you are probably going to ask..."Our cars already have a tach, why the hell would you want to install another one?" I have two responses to that.

Firstly, if someone wants to do that to their car, it is their car and they can do whatever they want to it.

Secondly, and probably *more* important, is that this DIY is a precursor to the LED Project #2 DIY (hint hint, coming soon). You'll need to grab the tach wire anyways, so might as well know how to do it.

Needed Parts-Applicable splice (I prefer the green clamp-down ones, 18-22 gauge, available at radio shack)-Extra wire

Needed Tools-10 mm socket-ratchet-small blade screwdriver-medium blade screwdriver-Torx-20 bit-Torque wrench: range 13-65 Nm

If access to an ECU wire is needed:-13 mm socket

Please be careful when performing this procedure. Read through the whole procedure before trying it. I can't be held responsible if I have made a mistake in the following steps.

i. Initial conditions-The hood is open-The battery cover is removed

Removing the cluster

1. Perform step 1.a of the Starter Motor Grind fix DIY.

2. Perform steps 6 through 12 of the MFA to FIS Cluster swap DIY.

3. Unwrap the black tape surrounding the blue connector for the cluster.

4. Locate the --GREEN WIRE WITH A BROWN STRIPE--. This will be pin 11 on the blue connector. This is the wire to splice into for your tachometer. Skip all of step 5 and all substeps of step 5.

MotiveMag Forums: DIY - MKIV RPM wire tap (for tach install, AVCR,... http://webcache.googleusercontent.com/search?q=cache:JGUmt4ATGu8J:...

1 of 9 5/12/2010 12:07 AM

Note: Some later model year cars (after April of 2002) do not have a green wire with a brown stripe. If you believe that this is the case, you must grab the wire at the ECU. To do this, perform thefollowing:

5.a. Perform steps 1 through 5 of the Cabin filter replacement DIY.

5.b. Pop off the passenger's side windshield wiper cover with a small blade screwdriver.

5.c. Remove the the 13 mm nut holding the wiper in place.

5.d. Spray some penetrating lubricant in the spline of the wiper. Then rock the wiper back and forth to get it off the spline.

5.e. Raise the windshield cowl and jam a piece of wood in there to keep the cowl raised.

5.f. Slide the locking tab on the right side of the small connector to the right. It should come out about an inch, and then the plug will slide right out.


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5.g Cut the zip-tie holding the cable bundle to the plug.

5.h Using a small blade screwdriver, pop the cover off the plug.

5.i Unlatch the locking clamp on the black hose, and draw the cable bundle as far out of the hose as you can.


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5.j Unwrap the electrician's tape holding the cable bundle together.

5.k Locate and label the appropriate wire carring the tach signal. Here is a summary of wire locations. You MUST check the wiring diagram appropriate for your car...I may have made a mistake in this list.Tapping into the wrong wire may cause SEVERE damage to your car.

AEG from Sep 98 - white wire, pin 63 on 80 pin connectorAVH/AZH from Aug 00 - white wire, pin 82 on 121 pin connectorAFP from Dec 98 - white wire, pin 82 on 121 pin connectorBDF from Oct 01 - white wire, pin 82 on 121 pin connectorAWD from Nov 99 - white wire, pin 82 on 121 pin connectorAWW from Jun 00 - white wire, pin 82 on 121 pin connectorAWP from Aug 00 - white wire, pin 82 on 121 pin connectorALH from Sep 98 - white wire, pin 67 on 80 pin connectorALH from May 99 - white wire, pin 110 on 121 pin connectorBBW from Dec 02 - white wire, pin 82 on 121 pin connectorBEW from May 03 - black wire, pin 43 on 60 pin connectorBEV from May 03 - white wire, pin 82 on 121 pin connectorBJS from Oct 03 - red wire, pin 106 on 121 pin connector


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5.l Splice into the wire using whatever means you have at your disposal.

5.m Perform steps 5.j. through 5.a in reverse to re-install the connector into the ECU.

5.n Push out one of the rubber stops in the firewall , and route the wire behind the dash. I found it was easiest to tape the other end of the wire to a long screwdriver, stick it through the dash, and pull thewire through.

Note: At this point, you should have the tach wire behind the dash, whether it is from the ECU or from behind the cluster. The following steps return the cluster to inside the dash.

6. Install the cluster by performing steps 7-11 in reverse using the MFA to FIS Cluster swap DIY.


5 of 9 5/12/2010 12:07 AM

That's it! Let me know with questions, comments, changes etc.

Mike

Chapter 11 Dubs: Member 001 - "Go broke or drive tryin"

bigmakMember

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FL/WA/VAay/bay/bay

Re: DIY - MKIV RPM wire tap (FaelinGL) » « » 4:56 PM 7-30-2006

hubba hubba.

Mikey, aim: bigmak040 | 42 draft designs | Virginia Tech Hokies ~ 04-16-07Quote, originally posted by firefighterjunkie »

Get off my bigmak!

█ eurogruppe ~ When mhmm and awkward are together, all hell breaks loose.

redfred18TMember

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chicopee, ma07 335i

» « » 4:57 PM 7-30-2006

nice writeup, this should go i nthe diy section

AIM: redfred18t

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Smoky_LlamaMember

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Omaha Ne.09' 2WDLuxury GTw/third pedaland turbo,Snocat Edition

Re: DIY - MKIV RPM wire tap (bigmak) » « » 5:07 PM 7-30-2006

Sweet

Bird Flu > MKIV Forum

Bristol Palin 4 Prez

Bless our fallen Soldiers, Sailors, Marines, and Airmen Quote, originally posted by VDUBber91 »

Ah, ok. For a second I thought they had trees growing in the kitchen. Must be parsley or something.

yannerzMember

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Vancouver BC2001 JettaWolfsburg

Re: DIY - MKIV RPM wire tap (mattyrj) » « » 5:26 PM 7-30-2006

nice writeup ...and your thumb looks like my big toe

spkn^GRMNMember

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Indian Trail, NCvehicle

Re: DIY - MKIV RPM wire tap (yannerz) » « » 5:41 PM 7-30-2006

My man Mike and his tech skills at work again!! Damn I'm glad he lives 20 minutes from me!!

-Wes- €€€•SPKNGRMN•™

jaywireMember

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cleveland ohio05 Gti

» « » 5:51 PM 7-30-2006

i love it!

ill be doin this as soon as it stops raining.

can we get a time frame for "step two"? ya know, the that has to do with led's.

FaelinGL Re: (jaywire) » « » 2:25 PM 7-31-2006


6 of 9 5/12/2010 12:07 AM

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Bump for the afternoon crowd!

Mike


oj1480Member

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Brklyn Queensnynew beetle 98,audi a4 98,jeeta 05, GIT10 soon

Re: (FaelinGL) » « » 2:31 PM 7-31-2006

good write up, even though i have no idea what this does.

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rs4-380Moderator

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Re: (oj1480) » « » 3:07 PM 7-31-2006

added

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mujjumanMember

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Queens NY01 Jetta VR6,06 Jetta 2.5,03 330

Re: (rs4-380) » « » 10:06 AM 12-11-2006

ncie write up!!!

mujjuman2001 Volkswagen Jetta VR6 + 2006 Volkswagen Jetta 2.5

Quote, originally posted by kraut_pauer79 »

wow, junkyards look like enchanted forests where you live.

stephan315Member

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Syracuse NY'05 MKIV GTI1.8T

Re: DIY - MKIV RPM wire tap (FaelinGL) » « » 2:04 AM 8-21-2007

From what I gather the DIY in this post is at a different location than the DIY in 1.8T forum (http://forums.vwvortex.com/zerothread?id=2668641)...

Does anyone know which one works better? I would like to add a shift light, do I need this part "MSD Ignition - Tach Signal GMR Pickup Part #8918" in order for the light to pick up the signal?"

<steve />

.DREAM.BUILD.TUNE.'05 GTI 1.8T226whp/247ftlbs14.02@98

cvillegtiMember

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CharlottesvilleVA2003 HondaS2000

Re: DIY - MKIV RPM wire tap (stephan315) » « » 2:26 AM 8-21-2007

im Mike (FaelinGL) and ask him. He has moved on to complete not only LED project #2 but numerous other FANTASTIC DIY writeups involving modifying the cluster (such as shift light, gear selection screen,

etc). He really knows his **** when it comes to this and will give you the right info

Quote, originally posted by LSinLV »

no, rice is not a lifestyle; it's suicide by stupidity.

LSinLV & jkrew... both victims of the VMG shenanigans. We you

vwteck2Member

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i have a 02 vr6 its say white wire on your instructions but i have two white wires?


7 of 9 5/12/2010 12:07 AM

suffolk va,1986 jetta gli,99 jetta glxmk3,02 boravr6

GhostmanMember

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NY

Re: DIY - MKIV RPM wire tap (vwteck2) » « » 10:45 PM 3-13-2008

Referring to 5k.

Tapping into the wrong wire may cause SEVERE damage to your car.

Is there usually only 1 solid white wire?

AEG from Sep 98 - white wire, pin 63 on 80 pin connectorAVH/AZH from Aug 00 - white wire, pin 82 on 121 pin connectorAFP from Dec 98 - white wire, pin 82 on 121 pin connectorBDF from Oct 01 - white wire, pin 82 on 121 pin connectorAWD from Nov 99 - white wire, pin 82 on 121 pin connectorAWW from Jun 00 - white wire, pin 82 on 121 pin connectorAWP from Aug 00 - white wire, pin 82 on 121 pin connectorALH from Sep 98 - white wire, pin 67 on 80 pin connectorALH from May 99 - white wire, pin 110 on 121 pin connectorBBW from Dec 02 - white wire, pin 82 on 121 pin connectorBEV from May 03 - white wire, pin 82 on 121 pin connector

FaelinGLMember

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Re: DIY - MKIV RPM wire tap (Ghostman) » « » 12:01 PM 3-14-2008

Quote, originally posted by Ghostman »

Referring to 5k.

Tapping into the wrong wire may cause SEVERE damage to your car.

Is there usually only 1 solid white wire?

Sometimes there is more then 1 white wire. Make sure you're counting the pins.

Mike


GhostmanMember

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NY


I have a 2002 AWP and am installing a Stewart Warner shift light. I'm also using a MSD Ignition - Tach Signal GMR Pickup Part #8918

On one of the other post it says to connect to pin #82...white wire ....and my tach numbers are extremely off.

What color wire is Pin #9? Is it the large white wire on the left in my pic below?

Here is a pic. I'm connecting to the upper right solid white wire. Is this correct if not what color is the correct wire? .....Thank you


8 of 9 5/12/2010 12:07 AM

Modified by Ghostman at 11:41 PM 4-27-2008

redline4lifeMember

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HoffmanEstates IL2000 Jetta VR6GLX

Re: DIY - MKIV RPM wire tap (Ghostman) » « » 2:02 PM 8-14-2008

I tapped into the same wire as well and my numbers are off also. is it supposed to be the other white wire just below that one. pleese help

ABD CAI, VF motor mount, 262's, l/w lifters, HD springs, Giac cam chip, autotech 10lb flywheel, autotech 2.5 exhaust

neVesMember

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Riverview FLSoon-to-beNew Beetle ITCcar

Re: DIY - MKIV RPM wire tap (redline4life) » « » 1:38 PM 12-12-2009

Update: Early AEG from January 98 to what's listed the signal is pin #6 green/brown wire on the 80 pin connector.

FYI both plugs on the ECU make up the 80 pin connector, #6 is on the larger of the two.

stealthmk1Member

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Philadelphia, PAMk2 Golf VR,Mk3 Golf VR,Mk3 GTI VR,Mk3 GTI 2.0,Mk6 Golf 2.5,4000q

Re: DIY - MKIV RPM wire tap (neVes) » « » 2:39 PM 12-28-2009

Just installed an Autometer shift light in a AWP 20th GTI. That white wire wasn't working for me but I discovered that the green/brown wire that is at pin 11 on the back of the cluster on earlier cars is still

part of the engine harness in the AWP, it just dead ends at pin 9 of the orange connector under the cover in the plenum. I tapped this and it's all go.

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