Connecting aftermarket tach....
Connecting aftermarket tach.... Have a 93 LT1 and I am connecting as Stewart Warner 2 1/16 tach with shift light and needed to know where do I get the signal wire for the RPM.... Is it off the coil or what any info would help. Thanks.
If it is like the 94 thru 97's you just tap the white wire from the PCM or if you have an MSD box with the tach output you can tap that lead from the box marked TACH output. Hope that helps, Mike
The instructions tell me to run it off the gren wire on a coil or rpm output from igntion box...... Now the green or brown wire from coil is off a traditional V8 HEI igntion. Dont have a MSD box.....but I have a LTCC coil over plug set up like the LS1 so there goes that idea. I will try the white wire or the wire coming off the stock tach....
Last edited by 1SLO6; Apr 9, 2006 at 09:18 PM.
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dont have a MSD box but i found two wires coming out of the PCM, and one white wire from the gauge cluster connector. One the two wires coming from the PCM seems to be a little thicker gauge than the other. So dont know which one to tap into on that but what about the white wire to the gauge cluster would that be a the signal wire from the PCM?
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Verdad Gallardo for anyone one thats wants to know the answer to this question.... off of the wiring harness near the ignition module and the coil there is a little box with thre wires. This is called the tach filter it has two white and one black..... One white goes to the coil connector, the other white wire goes to the instrument cluster, and the black is a ground...... Tap into the white wire that goes in between the instrument cluster and tach filter, not the white wire that from the tach filter and the coil....... freebie for everyone else..... Cant take all the credit have to thank Chris B. at Stewart Warner for the help.
