Another Tach Question

what year are we talking about?

original tach for a '66 has only 3 wires. And no resistor needed.

Z.

 

the resistor is a resistor wire that is between the tach and the coil.

here is the wiring breakdown:

the 3 tach wires are red, black, & blue/red

the blue/red wire is power for the tach bulb.

the red/green wire coming off the ignition switch plugs into the red tach wire (going into the tach)

the black wire (coming out of the tach) plugs into the pink wire which is a resistor wire. The pink resistor wire goes to a multi-wire plug under the dash on the firewall. On the underhood side it continues as a red/green wire and goes to the ignition coil

You do NOT want someone to fabricate this resistor wire. You can buy it from most Mustang vendors. NPD has it, page 160 on their catalog for $19.95. NPD Part number 12250-1

http://npd.dirxion.com/

hope I didn't make an easy answer too confusing.

if your tach wires are different colors than what I have listed, then you do not have an original tach, or someone has hacked up the wiring.

Z.

 

you might check to see if you already have the thick pink (resistor) wire in place before ordering one. Are you adding a Shelby tach to a regular Mustang?, if so the pink resistor wire will be going right up to the red/green wire coming off the ignition switch, you just unplug it from the ignition switch and plug in the tach wiring as outlined above.

Z.