Armedanddangerous

Here is graph I made of the latest temp sensors including what is supposed to be the Correct Values from Zip. The TS6T and the Delco0 are just about identical. The Wells TU% and Zip are just about identical. See graph. .

Armedanddangerous

That was supposed to be C2 temp sensors. The botton numbers are ohms, the side numbers are degrees F.

AZDoug

I see a 15-20* diff at similar ohm values, which is significant enough to make some Corvette owners do things like take out the thermostat, put in flex fan and AND electric fans,and add water wetter and cut holes in the hood, all unnecessarily.
Doug

kingwoodvette

SoCalErv

Would be interesting to have an original sensor on the graph as a baseline.

Armedanddangerous

The best way to tell is to connect either a decade box or a pot to the gauge instead of the sensor. Dial in a 210 on the gauge and measure the resistance it took. Then match it to one of the sensors. The adding a resistor can only lower the gauge reading, If the available sensors read low it is either resistance in one of the connections that is the firewall plug or the connector on the gauge. You can check the resistance from the gauge connector to the sensor connector. If that is less than 0.5 ohm than the only way is to recalibrate the gauge needle. Wilcox has a lot of data on what all of the values should be.

Frankie the Fink

You can do graphs, spreadsheets and pie charts all day long on this topic....if you don't have an original sending unit then everybody that has replaced their sending unit with a modern one has played "sending unit roulette".

Buying 4-5 of say a Wells TU-5 to get one that reads close to correct....

What you have done has been tried before: