LS1 Tachometer

**nokia2005** · 11-15-2006, 04:42 PM

Hi Guys,,

I'm wondering if anybody can help me with this:

I have a VDO Xtreme Performance Tach Gauge and would like to install it on a LS1 engine

but some one told me that its difficult becouse the LS1 ignition is Coil on Plug (COP).

So any help in installing this tachometer will be appreciated

**2001NBMZ28** · 11-16-2006, 10:20 AM

Not sure how to do it, but it's possible - seen LS1's with aftermarket tachs and shift lights. Maybe tap into the Engine Speed (Tach) Output Signal wire coming off the PCM? Here's the pins/colors for a 2K model for example, other years may be different: www.ls2.com/boggs/torques/00pinpcm.htm Don't know if this helps or not...

**89LX** · 11-16-2006, 10:50 AM

I installed the Stewart Warner Ultra Shift Light and wired to the PCM. Not sure on your type tach but I would think the instructions would indicate one way or the other.

**89LX** · 11-16-2006, 10:55 AM

Check this out. I believe your answer is there.
VDO Gauge Installation and Troubleshooting Guides:
http://www.egauges.com/Inst_PDF.asp

**nokia2005** · 11-16-2006, 11:33 AM

Tnx alot , i'll try your sugg..'s

**mrr23** · 11-19-2006, 06:39 PM

for f-bodies, you connect the tach lead to the #10 white wire coming out of the PCM.

**redline** · 11-21-2006, 10:00 AM

Yes its the white number 10 wire from the pcm. I was surprised to learn just how inaccurate the stock gauge really was. Its off 100 rpm at idle and as much as 300 rpm at 4000 rpm.