temp gauge

[netscott@earthlink.net]

has anyone had this problem. it seems that as my motor get hotter the
water temp. gauge reads hotter. that is to say that when i first start
my motor my electric fan will go on at 200, after some time the fan goes
on when the gauge reads about 215. is it possible that the resistance in
the wire from the sending unit is changing with heat and is causing this
difference.(i have replaced the sending unit and it did not help)

scott
B9472628