I'm working on a 1954 chevy truck conversion with a duramax swap. I have a lmm motor I'll be using but was wondering what the best harness would be to use or start with? I won't be using all the electronic stuff such as anti theft, air bags, etc, etc so it will be modified. Also I would like to use mechanical speedometer and other controls. Not certain on transmission yet but likely a zf6 or something other than allison. Any input is greatly appreciated!