I've installed 4 Painless wiring harnesses of various configurations.
The most recent was the "truck specific" 18 circuit harness that accommodates
a GM sterring column. This was for my 51 panel.
I'm sure the other manufacturers are good,too, but, I've used Painless and have never had an issue; plus they are very helpful when you run into a problem.
my 2 cents
mike
