Slant 6 No Spark

RustyRatRod said
Fair enough. Maybe this will help.

MoPar Instrument Cluster Regulator Update

If mine ever malfunctions, I plan on doing something similar.

The IVR isn't related to the ammeter.
The ammeter is a metal bar and a magneticly sensitive needle mechanism.
The current flowing through the bar moves the needle.
Diagram and explanation on this page
Electrical Fundamentals (Session 220) from the Master Technician's Service Conference