I have a GV behind the 511 wedge in my 69 Super Bee and love it. My only caution is: make sure your power source is a switched accessory. I was having issues with the controller intermittently shutting down. I had it wired to the ignition power source and was getting power spikes during start. I called GV and they said the low voltage spike during start causes the controller to act up. I moved the main power source to a switched accessory source, problem solved.