During a conversation regarding voltage drop for the stock gauges on my 46 Ford I had mentioned that I was going to go with the C & G 3 wire unit they advertise in their catalog. I was to told that people have been having trouble with this 3 wire unit and it didn't last 3 months. I had taken the gauges and well as the speedometer to the Speed O shop to be checked out. The speed O needed to be rubbed on a little but all of the gauged checked out fine. Have any of you guy's used this 3 wire voltage drop unit with success.