Designing an Engine Oil Temperature Display Gauge Project

[17-CB-002]

Csory (Hungary), may be you can help in this project.
After reading from your (Csory) idea on building display gauge, I pulled out some info together on the design of an Engine Oil Temperature gauge.
By tapping into the actual "EOT" circuit between the ECM and the EOT sensor, one can read the ACTUAL oil temperature in "volts".
The reading should be anywhere between 4.9v "Cold" and 0.01v "Hot".
When referring to the Toyota ECT Voltage/Temp conversion chart, one can logically deduct the actual Engine oil temp..
As per the Toyota ECT Theory file- The ECM feeds a constant 5 volt through 2 resistors (One fixed inside the ECM and the second variable NTC resistor inside the EOT). All are BOSCH design.
Negative Temp Coefficient (NTC)- when the sensor is cold, her resistance is high and vise versa when it reads hot, the resistance drop).
In theory, at room temperature, one should read 2.2 volts and around 0.02 volts with a normal hot engine

Note: If you are checking the EOT voltage, you will require a "High Impedance" meter or the meter will affect the reading).

Good Luck.

Handy information is contained in these links,

https://i.postimg.cc/SQnXpVtd/2-A0-ABFF7...F930-D.png
https://i.postimg.cc/j2nYkDc6/39-D706-BD...A75825.png
https://i.postimg.cc/JtwCwRYf/9-C4-C1-EC...FD0-E1.png
https://i.postimg.cc/pV3mV8wH/A6-B63664-...-CBA41.png