There are several threads on this forum about the Limiter and testing gauges.
Perhaps the quickest method is to take a 12v test light and plug it into the slip fit connector for the coolant temp. sensor on the intake manifold or the connector on the gas tank sending unit. Pull the wire connector off the stud and stick the probe inside the connector. You should see the test light pulse ON and OFF. I'm guessing about two times a second.
You can also pull the connector off the stud and jumper wire it to a ground source. (engine block , frame, etc). Do this for a very brief moment and have someone watch the gauges. They should swing towards the Full or Hot range quickly. Disconnect your jumper when this happens so you don't burn out your gauges.
