87 gta tach wire location
87 gta tach wire location
Im trying to connect my tach to my ls1 pcm but I dont know exactly where to find the white tach wire to connect to in the dash. Could someone help me please ?
Joined: Sep 2004
Posts: 5,906
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From: Chicagoland Suburbs
Car: 1989 Trans Am GTA
Engine: LT1, AFR 195cc, 231/239 LE cam.
Transmission: M28 T56
Axle/Gears: 3.23 10bolt waiting to explode.
Re: 87 gta tach wire location
C100 Diagram
Re: 87 gta tach wire location
Might vary based on year, but for my 89 the Tach wire is D6 on the C100 connector. This connector is the weather pack connector located on the firewall right next to the Brake Booster.
All remained the same for all 3rd gens regardless of year and drivetrain
Re: 87 gta tach wire location
Pocket, in order to make my tach work I need to hook up a 12v ign wire with a 1k resistor to the white wire, right? Is that all I need to do or is it also necessary to make changes with hptuners ?
Re: 87 gta tach wire location
Most firebirds require a step-up booster wire. I use a 680ohm resistor hooked to a fused 12v IGN source, but there isnt a set rule for how much it needs
You also need to change the tach output from 4cl to 8cyl
You also need to change the tach output from 4cl to 8cyl
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