I actually have one mounted on the firewall in my GTS, that is gutted, and wired direct, behind, where you can't see it. Thats because I was running Pertronix Until it crapped. Now I have points back in the dizzy, and I put a normal resistor , laying next the the wired straight one, plugged into the harness, just for use with the points. I'll pull it off when I put the Pertronix unit back in the Dizzy.....