Installing the gauge in place of the stock voltmeter was a bit more work . . . . but it did (eventually) fit in there - With a few tweaks. Mine isn't rubber mounted like the stock voltmeter was, which means the indicator lights (Turn, Beam, Pressure and Neutral) are no longer rubber mounted either, since they mount on the back of the gauge. Hopefully I won't have a big problem with vibration ruining the gauge or the lamp filaments - We'll see
The meter is slightly smaller than the hole in the cluster face, so I had to make a spacer for it to fit. The gauge fits perfectly inside a piece of 2 inch PVC water pipe and the spacer looks for all the world like the rubber cushion that the old voltmeter mounted in, doesn't it? There is a recess cut away on the back side of the spacer which hold the gauge centered in the hole
The illumination bulb for the gauge is an automotive one and it's too bright to match the speedo and tach, so I painted the top half of the bulb with black paint and that toned it down enough to look like a match
The little round LED in the unused bezel next to the Beam indicator is my new voltmeter. It's a Tri-color LED which lights up either green, amber or red. Flashing red for a really low voltage (below 12 or so) and steady red for anything below 12.5, amber for 12.6 to 13, steady green for 13 to 15 and flashing green for anything above 15. The LED is plenty bright, so it will really catch your eye, but when in the steady green zone it dims after about 5 seconds so that it won't be a distraction at night. The guts of the meter is in a black anodized metal box a little smaller than a box of wooden matches and I mounted that on the back of the gauge cluster with some epoxy
I'll get it on the bike in the next couple of days and see how everything works, but it passes all the preliminary tests so I don't anticipate any problems. Gotta remove my crossover tube for the front forks as it's in the way of the voltmeter box
Don