Originally Posted by
Paul
Hi Corky
I can also vouch for the inadequacies of the Corse harness. Although time consuming, I was able to figure out the diagram well enough to make it work, but did need to modify in a number of areas. One thing to be very careful of is the grounding. I found that the ground returns for a number of circuits were not sufficient - can't remember everything, but one simple example is the rear lighting harness - there were maybe half a dozen connections for the rear lights but only a single thin gauge ground return for all of them. Same with the front lights. I added quite a few additional ground wires, and grounding studs on the chassis also, and daisy chained them all back to the battery so that I wasn't relying solely on conduction through the chassis to complete the circuit (except in the case of the starter due to amount of current). There were also a few 12V supplies that I either ran thicker wires or put in relays.
Looks like it doesn't apply to your gearbox, but I discarded the electronic sensor and ran a mechanical cable from the gearbox to a Fiat speedo instead