mred

iTrader: (5)

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.

mred

iTrader: (5)

all this knowledge and no one knows,lol...
i guess i will have to use the feed off the ecm and run my own wire.
so much for running a autometer tach and tach adapter

thunderstruck507

iTrader: (18)

Your post isn't very clear. You talking about the gray wire on an aftermarket tach harness or the wire from the pcm that controls tach signal?

mred

iTrader: (5)

says it in the post.
The Gray wire of the adapter is your new tachometer signal output.

wrea398

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.

sum guy

iTrader: (4)

I wired my truck straight from the computor to tach and later added said resistor with no noticeable changes. Keep it simple.

69cutlassrkt

this is the way to go

mred

iTrader: (5)

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