So....wiring my triple pillar pod. Got everything in there, and everything lights up except my tach (well actually, my voltmeter burned out [:@]so i'm getting a replacement), anyway, my tach has 5 wires coming off of it, a postive (red) and negative (black), a tach signal (green) and then an extra red and black that attach to a harness/resistor. I have both of the reds and both of the blacks wired to 12V and ground, then the tach signal wired into the blue wire coming out of the harness on my gauge cluster. And, no tach reading. So anyone know why i have so many wires coming out? Why would i need 2 12vs?

 

ah man gotta love the old muscle cars.. one wire to the distributer cap to the ground the 12v and ignition and done
i don't got any idea man tho does it come with instructions at all that would say why theres a second set of gr and pw

 

yea the instructions say the tach has 4 wires, green, red, white and black. Black = ground, green = tach signal, red = 12v and then white is to come on only when the lights turn on ya know? But mine doenst have that, it has two reds, two blacks and a green....

 

I'd presume the extra red and black is for the dial light, if it has LED lights the resistor may be necessary for that. You might have the wrong wire under the dash or something is wrong with the car's wiring so the tach signal is not there. Try a temporary wire right to the distributor.

 

yea the extra red/black is for the backlights, because when i unplug the little harness right before the resistor the lgiht turns off. As for the signal, i know its the right one, but its still not giving me a reading, so i think i'll try the distributor like you said

 

im having sorta the same problem. i got my tach hooked up and everything, but the reading on my aftermarket tach is not acurate. its delayed i think. did you ever figure your problem out?

 

Might wanna check your tach for an adjuster dip swith pannel, most units have a lil bank of switched (or a slider swith or something) to adjust the gauge to display proper for how many cylinders.


As for the tach signal I could only say check your connections, and if need be run a test wire from the tach service port on the driverside of the engine bay (lil blue wire goes into a rubber grommit all by itself) to the tach and see if it's that....

 

ok so i learned that there is a wire i have to cut on the back of the aftermarket tach for the autometer guage.