If the contacts in that limiter stick closed it will cook whatever gauges are in service and reek havok on the charging system including the amp gauge.
Here's what I would do. Disconnect the battery, Remove the ignition switch bezel nut and drop the switch and harness connector from under the dash. Locate the 2 blue wires in one female spade terminal. Rollthe dice by clipping one of the 2. If the car starts and runs you clipped the right one. If it doesn't start re attach that one and clip the other. If the amp gauge doesn't start working again, check the charging system. System voltage regulator may have died also. At least you'll have the original limiter disabled and not further damage can occur plus you'll know you're not running on the battery alone.
