welcome first of all, second of all DO NOT DRIVE THE CAR WHEN THE NEEDLE HITS RED, fault or not.
just because the rad cap isnt overflowing doesnt mean that your not overheating. you probably have a stuck thermostat and the car isnt able to cycle the overheated coolant out.
please dont drive the car untill you get it resolved. you can potentially ruin your engine if you continue to drive it.
if its a fault in the cluster consider yourself lucky.
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