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Per the 700/900 FAQ under "features" button above:
Temperature Gauge Fluctuates. [Query:] I just noticed my heat gauge flutters from the left to middle (not into the hot Zone) . There does not seem to be any pattern to this, smooth roads or bumpy, acceleration or slowing , whatever. It looks normal for a while, and then starts getting the jitters. [Response: Steve Ringlee] To test your gauge, get an appropriate resistor from an electronics store (preferably with a 5W or above rating +/-5% tolerance), solder an alligator clip to one end and a quick disconnect connector to the other. Pull your connector from the sensor (the one under number two cylinder intake manifold on B230F engines) and insert the quick disconnect into the half of the connector wired to the gauge (not ground). I recall that out of the panel this wire is yellow-white. Check your wiring diagram to confirm this. Attach the alligator clip to ground and turn on the ignition. Your gauge should read in the hot end if it works. If it doesn't, then either the gauge or the wiring harness to the gauge is faulty. Clean wiring connectors with electronics connection cleaner (such as DeOxIt) and test again. If it reads correctly, then the sensor is bad.
Coolant temperature gauge sensor resistor ratings for 7XX/94X cars are:
1. Cars from 82-86: 87 ohms to get a 90C reading at the gauge (range: 217 ohms +/- 35 ohms at 60C/140F to 67 ohms +/- 15 ohms at 100C/212F)
2. Cars from 87-93: 206 ohms to get a 90C reading at the gauge (range: 560
ohms at 60C/140F to 153 ohms at 100C/212F)
3. Cars from 94 on: 75 ohms to get a 90C reading at the gauge (range: 780
ohms at 20C/68F to 75 ohms at 90C/194F)
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