Mopar Tachometers
79 Dodge Power Wagon Tachometer
A customer asked me to try to repair the tachometer from his 1979 Dodge Power Wagon. Unfortunately, the ammeter was mechanically bad, so I had to refer him to Redline Gauge Works for a total innards replacement. However, the ammeter was still complete from an electrical perspective so I was able to reverse engineer this tachometer and was even able to get some good scope traces. Here are the schematics for this tachometer:
If you would like to read the full reverse engineering document for this tachometer, click here.