Join Date: Sep 2000
Location: Shrewsbury, MA, USA
There are several under dash harnesses There are two harnesses for cars with consoles and on for cars without consoles. If your car originally had a console, but no gauges then the the underdash harness has the wires in it for the neutral safety switch, interior lamp, and the shift plate illumination. If its a 4 spd then the only thing in there is the interior lamp at the back of the console. The under dash wiring harness for cars with consoles and guages have all of the wiring for the water, temp, fuel level, and ammeter built into the dash harness.
The extension harness for adding gauges to a console consists of a Y connector that goes in line with the existing underdash harness and the console wiring harness. The third leg of the Y contains the wires for the Ammeter, low fuel level light, water temperature sender, and the connection to the existing fuel sender wire. The ammeter and temperature sender wires get routed through the bulkhead penetration into the engine compartment, the rest get spliced into existing wireing up under the dash.
Yes you can make your own harness as long as you can get the mating halves of the connectors for the connector at the front of the console. Doing it that way makes for a neater installation anyway, since you don't have the "Y" connector showing at the front of the console.
1969 Indy Pace Car
350/300HP RPO Z11