76 wiring harness?

When I talked with Painless wiring about my 1975 vehicle, they stated that Chryco started using some GM key switch electronic and turn signal parts about that timeframe. So applications can be hit or miss as far as colors of the wires etc. I used the Painless generic Mopar 14? circuit kit. I did have to splice in for the the orange Reverse light on the dash that illuminates when the four speed is in Reverse. For the most part, it is a very good kit, but it is generic.
I don't mind generic. There's some auxiliary equipment I want to hook-up anyway; ignition switches and a battery cutoff, as well as getting led lighting setup. I want to modernize the gauges too. As long as a generic kit will support some of these functions I'll be happy.