The search feature is your friend on this!! There is a thread on here about the ammeter to voltmeter conversion on rallye dashes, MAD electrical upgrade, removal of voltage limiter from fuel gauge and installing a solid state external one. DO your homework, do it once, and be done for 40 more years. I also refaced my odometer, had my gauges recalibrated ( redfish ) , replaced all bulbs and sockets, removed and polished lenses with a headlight polishing kit( the one with the powerball worked great) stripped and repainted bezel along with a decal from DMT. Can't stress it enough, search, search, and search more. All of the info is on here from some of our great members.