Just mounted these up for my buddy in his bj42. Gotta love 24v wiring. His friend used an ignition source with a converter to 12v and a relay for the lights. Course now it's not working and I have to reinvent the old wiring. Least the gauges look nice. Some flat plate aluminum with 2" hole saw cuts that I enlarged slightly with my die grinder till they fit snug. Cool thing is the gauges barely slip into the stereo opening without modifying it. I should have made the aluminum a bit wider and I could have hid the screws in behind that rubber trim stuff.