Wiring Harness - Standard/Rallye

[MR291]

Hi,

I have a 70 Gran Coupe with standard gauges and am converting over to rallye.  I bought a set of 70 rallye gauges, but does it matter which rallye harness I get.  70-71 or 72-74.  Also does this mean I will lose the plug in capability for my overhead console or is there a specific Gran Coupe rallye harness.  Or in the end should I be retaining the original harness and figure out a way to modify for the rallye guages (just for the clock and tach?).

Appreciate any help.  I'm confused.

Thanks.

Jerry

[PlumCrazy]

Each year had it's own unique dash harness.  Overhead consoles harnesses are separate from the dash harness.

[72hemi]

First off the gran coupe overhead harness is a plug in so you are fine there. Second 70 has a different fuse box then 71 to 74 (the horn relay is different), it is not difficult to convert the standard harness to work with rallye gauges, you have to run a wire for the tach and clock and there is a different oil pressure sender and you have to modify the wire for the oil pressure gauge from the oil pressure light. There are a few threads on here about converting the standard harness to rallye gauge harness if you need more info on the specifics to modifying the harness.

[MR291]

Perfect.

I will stay with the original harness and modify where required.

Appreciate it.