Tom; I use a Garmin GPS on my Electra Glide. The Garmin power plug will contact the tank at full left lock unless you have it turned to just exactly the correct angle. You can lean forward and look straight down to find the angle. Admittedly, it does not hit hard, but I decided not to take a chance. I got a dual 12v outlet at OReilly's auto parts ($8) and cut one outlet off. The part that plugs in is shorter, and can't hit the tank. It makes a bit of an unsightly mess with everything coiled on the left bar, but my wife also uses the GPS in her car, and I can't cut the cord. Next time I have the tank off, I'm going to hard wire the new 12 v receptacle to the battery and mount the receptacle to the Left front tank mount.