Could be a loose connection. If you can get to it check that the wire(s) are secure and not corroded. The trouble with a lot of Motorhomes is that it's all crammed in and hard to get to.
Another idea is for the price of about an hours labor you can buy a ScanGuage D, plug it in the port and get your temp plus numerous other readouts (speed, boost, gallons per hour, oil pressure, gas mileage etc....The ScanGuageD is digital and a lot easier to read than a dial.....mine is a lot more accurate. Get on line and check out what they do and you might not want to fix your temp gauge because you won't be looking at it anyway.
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Bruce & Teresa
2000 Foretravel
U320 4010
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