misreading temp gauge

Read my recent post www.forabodiesonly.com/mopar/showthread.php?t=269976.

I measured ~340 ohm at 61 F for the coolant temp sensors in both my A-bodies. A thermistor chart (NTC) extrapolates to 20 ohm @ 203 F and 10 ohm @ 257 F. Similar to RedFish' values in post #6. With a 20 ohm resistor as simulator, my gage read what most consider "normal", tic just below halfway.