hooking up tachometer question?

im going to hook a tach on my comet today, im pretty sure i know were all the wires go but im not positive, the tach has 4 wres coming out of it. red,black,green,white. The red one i hook to a power source, the black one is a ground, the green one im not sure about, i hook up to the positive side of the coil?? and the white one is for the light in the tach. My question is do i have the wires right? what is a good power source to hook to under the dash? Thanks nate

 

the tach doesnt have a shift light or anything, its a plain pro tach. thanks Nate

 

yep, you got 'em right... Black = ground, red = hot, white = light, green = actual tach wire to coil.

 

kool thanks nate

 

Nate - Hook up the 12v line to switched power that is only on when the ignition switch is in the run position.

Dan

 

Hook up the green wire to the negative "-" side of the coil, otherwise the tach won't have a signal.

 

I think you want the negative side of the coil, not the positive. If it matters. That is where mine is.

 

yeah, it is the negative, i hooked it up to the positive and it didnt work, no wonder why!!! thanks nate