Can anyone help me, I want to install a tach in my 89 F250 that has a 460 and 4WD. My question is which wire on the coil do I hook the tach's pick-up to? Coming from the coil there are two dark green/w yellow strip wires that I think are the correct ones but am not sure since my Chilton's manual doesn't contain a good wiring diagram of the coil.

Also, is there anyway to wire into the harness under the dash or am I out of luck since my truck came w/o a tach (there might not be a pick-up already wired to the coil?)

Any help would be greatly appreciated as I can't stand not
having a tach on a manual vehicle

Thanks,

-=Bigmike