Stereo & Electronics - harlan shift light

hey isnt there a way to just hook the rpm connection on the shift light to the tach on the speedo instead of hooking it up to the pcm? or even under the dash where the ob2 port is

Not that I'm aware of, just run a wire. Its not that hard, really.

Peace,
Craig.

dont see any difference because its all connected to the pcm

noone else

Stock Tach is run via serial data messages, not from the tach output from the PCM.

Hell, the tach line doesn't even come into the cabin on the LS1 cars.

ok how about the obII port?

i think its pin 3 for rpm isnt it

i think its pin 3 for rpm isnt it

no.

trust me, if it was in the car I'd tell people to connect it there.