Glad to hear you got it working!
The running hot could simply be due to the new sending unit not matching the gauge. There have been numerous reports of the aftermarket replacement sending units not having the correct temperature vs. resistance curve to give an accurate reading on the stock gauge.
Lectric Limited offers accurate replacement sending units. But before investing in another sending unit, you might want to try testing the accuracy of the one you have now as shown here -->
http://www.madelectrical.com/worksho...mp-gauge.shtml