I have done quite a bit of business with Madd. I used their methods and some of their packaged kits when I rewired the Studebaker. Excellent technical support and quality materials. Not quite as plug and play as the others though, great for cusomizing existing wiring, and you need to do some soldering to finish right.

I have also dealt with the folks at EZ wiring as they also have Dolphin Gauges. Found their technical support to be first rate.

Pat