Tach Adapter in 1972 Firebird
Tach Adapter in 1972 Firebird i have done everything per the instructions and i cant get a reading from the gray wire.
i am getting voltage in all the right places minus the ground and gray wire.
i have replaced both Autometer Tach and Tach Adapter,nothing....
(The most common wire color used for power to the coils is Pink. Follow the Pink power wire away from the coils & connector to where it is most comfortable to work with(Auto Meter suggests 2”-6” away), then cut this wire in half. Repeat this on the other side of the engine as well. Run the power-side Pinks (left & right) together and attach to the solid Red of the adapter. Next run the coil-side Pinks (left & right) together and hook to the Red/Green of the Adapter. Ground the Black wire of the adapter to a suitable chassis ground. The Gray wire of the adapter is your new tachometer signal output.
i am getting voltage in all the right places minus the ground and gray wire.
i have replaced both Autometer Tach and Tach Adapter,nothing....
(The most common wire color used for power to the coils is Pink. Follow the Pink power wire away from the coils & connector to where it is most comfortable to work with(Auto Meter suggests 2”-6” away), then cut this wire in half. Repeat this on the other side of the engine as well. Run the power-side Pinks (left & right) together and attach to the solid Red of the adapter. Next run the coil-side Pinks (left & right) together and hook to the Red/Green of the Adapter. Ground the Black wire of the adapter to a suitable chassis ground. The Gray wire of the adapter is your new tachometer signal output.
Last edited by mred; Nov 1, 2010 at 07:36 PM.
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RE Tach adapter I just did an electric autometer tach in an LS7 Monte carlo. Use the wire from the ECM to the signal wire on the tach. Put a 1K resistor between the ECM signal wire and the 12V tach source wire close to the tach. No adapter needed. Works fine.
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thanks for the input guys.
your suggestions is what we decided,but the after market wiring harness added the wrong color wire at terminal/pin GREEN 38.
so we had to do some double checking.
all is well now,.
thanks
Ed
your suggestions is what we decided,but the after market wiring harness added the wrong color wire at terminal/pin GREEN 38.
so we had to do some double checking.
all is well now,.
thanks
Ed
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