The coolant temperature gauge in my 1981 300TD seems to read high. I've checked it with an infrared temperature sensor gun at various points on the hoses and it supports my theory. I replaced the sender and it made no difference. I would like to sort this out. One idea I have is to put a secondary sensor and gauge on, but that would mean sacrificing a hose and would cost me about $60-$70.

What are some other ideas for determining if my temperature gauge reads high?

__________________
Mike

1980 300SD
1981 300TD
1998 E320 Gasser Wagon
2000 SL500