I am also fixing a "someone else's problem" bike and in my case the actual water pump impeller itself was shot and I needed to replace the pump
if you can pull the pump cover it's not a bad idea to check
also check your thermostat is actually working it may be bad
Maybe you have a blocked pipe somewhere too ... not out of the question
But as mentioned it is likely to be the gauge itself - infra red thermometer is the way to go for sure to see if it is even an issue
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