Have had my TD42T since new (1999) and this has occasionally been a problem.
Unless the needle is going past the last mark on the guage its only running hot, not overheating.
Generally its a sign of high EGT so try dropping back a gear and have it revving harder (sounds bizarre but true).
I wouldnt worry about mine if it didnt cut the bloody aircon off and make the wife and kids start whinging.
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