Tach hookup on LT1 optispark
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Joined: Nov 2015
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From: Kansas City
Car: 1984 &1987 Firebird, 1991 GTA
Engine: 5.0(84) , 5.7L LT1 (87),5.0(91)
Transmission: Automatic
Axle/Gears: 3.23;3.42;2.73
Tach hookup on LT1 optispark
Any help would be much appreciated. I have a 1987 Pontiac Firebird into which I swapped an LT one motor with an OPTi spark from a 1994 Pontiac Trans Am.
The Firebird does have the V8 tachometer installed, but I am not able to get this tach to work properly or consistently. I have hooked it up to the tech output on the PCM… And that does not seem to be working. Has anybody hooked up this similar set up and how did you do it?
I have tried a buffer and I have tried to hook it up to the coil pack directly… No success there.
The Firebird does have the V8 tachometer installed, but I am not able to get this tach to work properly or consistently. I have hooked it up to the tech output on the PCM… And that does not seem to be working. Has anybody hooked up this similar set up and how did you do it?
I have tried a buffer and I have tried to hook it up to the coil pack directly… No success there.
Last edited by Jacques101; Feb 9, 2022 at 06:24 AM.
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