I never got around to posting a thread from when I did mine. I overhauled my cluster 2 years ago & swapped a SunPro voltmeter in place of the ammeter as part of doing some electrical system upgrades.
It took a bit of finesse & mods, but I overlaid the SunPro gauge [round] faceplate on top of the ammeter faceplate. The sunpro faceplate is a bit more glossy black, but I'm satisfied with my results. Not a job for a novice. Here's a few pics...
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