Redoing my dash and decided to convert my existing ammeter to a voltmeter. Ammeter is from a 70 b body rally dash. I swapped the guts from a Sunpro voltmeter ($17) into the ammeter assembly. Used an ammeter overlay from PCG since I couldn't find anyone making one for a voltmeter. I calibrated the new setup at 12V and 15V so i know where the readings are on the ammeter face. I also swapped an existing pointer so it matches all the other gauges.