Gauge Cluster Issues/IVR

RedFish said
Mechanical limiters are just that... mechanical. It works fine until it fails. We know it will eventually. We know its 50 years old. So, run it until you have no choice but to replace it or take advantage of opportunity to replace it.
We dont know how long a solid state regulator will live either but... with minimal effort we can locate the thing by the fusebox or anywhere it can be replaced in a minute.
The E-body doesn't have its limiter in a gauge or even plugged into a circuit board. Hell there aint a circuit board. Their limiter is hanging with a screw like a horn relay, etc... That's Chryslers optimal "how to" example.
My own solid state regulator is still mounted where the noise capasitor was but... I have a custom built rally panel. I think I could pull the stereo and reach though that opening to replace it if needed. It has been in service more than 13 years now.

I'm fine with letting run 'til it dies. Pulling the panel wasn't that difficult.
I am not fine with putting it, or any of the gages back if they are not fully operational. That's what I want to verify.
Today's test seem to show everything working. I say seem because there were a couple anomolies to the results.

Each gage connected individual to a pair of D cells showed a relatively high reading.
The IVR output on the multimeter 5 Volt scale bounced over 5 V each swing, but on the 15 Volt scale, only bounced to roughly 4 Volts.
Of course that's pretty crude way to evaluate the IVR output.

Attaching a 22 Ohm resistor to each gage's output stud brought all of the gages to 1/2 when the IVR was supplied 12 to 14 Volts.
This seemed closest to an operational evaluation.
The only hiccup was the temperature gage which hung at the 1/6 mark for a while and then suddenly clicked to 1/2 scale.
I'm guessing that would have to be a mechanical hangup to jump like that.

Nothing fancy here. Mostly jumpers. A few crimped connectors for the 12 volt supply, and the only resistors I have happened to have.