gauge frustration

66Glassback said
I have a 1966 Barracuda. The voltage limiter in the temp gauge stopped working and burnt out some of my gauges. I purchased a used instrument cluster which the voltage limiter in the temp gauge also didn’t work. However, I took 3 AA batteries taped them together to get 5 volts and tested all the gauges. They all swept properly. I purchased an external limiter and installed on the outside of the cluster. I took the 12 volt feed to the temp gauge and spliced a terminal on the wire so it would plug into the voltage limiter. I then plugged the voltage limiter into the other terminal on the temp gauge. My temp gauge stays on cold. I test the senor wire for voltage and I am getting the proper swing about 0 to 6 volts on and off so I know the limiter is working properly. I ground the sensor wire and the gauge sweeps properly. I am on my 3rd sensor and cannot figure out why it is not working. Any help would be greatly appreciated.

You are confused. The only limiter is in the FUEL gauge which has 3 terminals. This internal limiter is used on the early A's and on the later ones with a Ralleye cluster.

1 terminal is 12V from the ignition switch, TO the limiter, the limiter outputs 5V nominal (pulsating) to the fuel gauge internally, and also feeds the 5V to another of the 3 terminals. The last terminal is of course for the fuel sender

The terminal with the limiter 5V output connects to a PC board trace which feeds the limiter output to the temp gauge and oil gauge, if equipped.

Here is an article on conversion. you MUST somehow isolate the old limiter to avoid problems.

https://www.rt-eng.com/index.php/RTE_Limiter2_Faq.html
If you have a good ohmeter, you can "set" a rheostat to the proper gauge test resistances and find out if they work correctly and accurately, or order some resistors of the proper values

https://www.forabodiesonly.com/mopar/threads/checking-gauge-function.466239/