I have used painless wiring kits and I must say that if you follow the instructions they are an awesome product. I have installed two. The first was a universal kit in a '49 Plymouth and the second was in a '77 Corvette. Both kits worked flawlessly... My favorite part is how every wire has what its for written right on it so no guess work, big bonus if your color blind like me. Just my .02 cents and shameless plug.