The sender is a resistance device - as temp rises, resistance falls.
At room temp, it's resistance is approx 1.2K. At 300 F, it is 20 ohms.
Because the LM3914s expect VDC signals, I mounted the sender in a voltage divider where the other resistor is 100 ohms. I can't switch the placement of the sender and the 100 ohm resistor since the resistor body is ground and there is no physical way to connect a resistor between it and ground. (That would have made this whole discussion moot.)
Here's the actual values:
Temp (F) Volts
75.95805885 4.411105697
99.38811075 4.178817414
103.4905373 4.131298914
108.6509062 4.06847612
113.1891353 4.010380743
116.7294946 3.963193856
121.446127 3.897779991
129.8503198 3.774030566
148.0312684 3.47587523
152.5678207 3.395428119
165.6902423 3.150974375
172.5294622 3.017662463
173.1341782 3.00571271
184.352917 2.780216073
195.0464098 2.560833184
199.367952 2.471714595
208.3383018 2.287215993
215.6816466 2.137809847
217.988014 2.091373056
226.5830976 1.921094391
234.3402248 1.772093932
241.9148636 1.631845558
253.7005746 1.425688655
255.7584758 1.391336252
265.1715596 1.240856925
278.1551202 1.051915642
294.0334575 0.850717827
300 0.783454764
I can send you the Excel sheet with the complete setup if you'd like.