Temperature & oil gauge profiling (rally pac)

[Lady72nRob71]

Yesterday afternoon I finally took out Lady after 2 months of improvements...
All was well but the gauge cluster of the repro Rally Pac I got from the Parts Plce. It does fog up behind the lens like others had mentioned.

The worst of all is that "normal operating temperature" is indicated at almost full hot! I would assume it should be in the middle.
I know the engine is not running hot, as I can still hold the valve covers and touch the block for a short time.
Idling, 60mph, and heater on full blast caused the needle to fluctuate from HOT to the bar below. Max temp from the heater was only 150 degrees.

I am using a stock replacement sending unit (borg warner WT203) and it reads 100 Ohms (disconnected) and 6.11V (connected) at normal operating temp. I let it cool and took measurements along the way. The gauge middle line is 130 Ohms and 7.03V. A tad above 'C' was 320 Ohms and 9.4V. It does not seem to be a linear scale.

-- Has anyone ever took measurements of their sensors at different temperatures?? I need to see if it is the sender or the gauges.
Would someone be kind enough to take a few measurements?

I will call the parts place to see what they recommend but they will probably blame the sender, as it was not bought from them...... Hate to yank it out yet because I sealed it in so well...
I will borrow our lab's IR thermometer and see what actual temps are this afternoon. At worst I am hoping I can put a resistor in series with it to calibrate it to my sensor. OR maybe the gaude inside the cluster can be calibrated...

The oil gauge reads a little above the middle at the lowest idle and goes up a notch above; not too badly off.

I drove this car home through 98 degrees for over a thousand miles so if there WAS a problem, it would have surfaced already...

Any ideas?
Thanks!