Firebird 89 ls1 prob with tach
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Junior Member
Joined: May 2012
Posts: 2
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From: Drummondville, Qc
Car: Firebird 89
Engine: Ls1 corvette 03
Transmission: T56
Firebird 89 ls1 prob with tach
Problem with tach on a 89 firebird ls1
Hello I have a problem with my tach on my 89 firebird with ls1 engine. I bought the car and the previous owner had installed an aftermarket tach and 5 inch tach with tach adapter model 9117. The original cluster is also connected to the tach adapt. In short, my problem is that when I presses on the accelerator, my original cluster drops to 0 and when I release the throttle it goes back to the rpm of the aftermarket tach. Is that the problem is someone has already happened. thank you
Hello I have a problem with my tach on my 89 firebird with ls1 engine. I bought the car and the previous owner had installed an aftermarket tach and 5 inch tach with tach adapter model 9117. The original cluster is also connected to the tach adapt. In short, my problem is that when I presses on the accelerator, my original cluster drops to 0 and when I release the throttle it goes back to the rpm of the aftermarket tach. Is that the problem is someone has already happened. thank you
Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Re: Firebird 89 ls1 prob with tach
Welcome aboard thirdgen.org.
I moved this to the engine swap subforum for LS swaps.
Sounds like you need the signal boost mod (or whatever it's called). Basically tap a switched 12v source, put a resistor in it to the tach output from the PCM to give it more voltage to drive the stock tach. https://www.thirdgen.org/forums/ltx-...ch-issues.html
I moved this to the engine swap subforum for LS swaps.
Sounds like you need the signal boost mod (or whatever it's called). Basically tap a switched 12v source, put a resistor in it to the tach output from the PCM to give it more voltage to drive the stock tach. https://www.thirdgen.org/forums/ltx-...ch-issues.html
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