Air Intake & Coolant Temperature Sensors for the 16v Turbo running MicroSquirt 3.0

For coolant and air intake temperature sensors, I wanted to run Bosch units for two reasons. A daft desire to stay under the OE roof and because they share the same resistance curves. The air intake temperature sensors would have been Bosch part number 0 280 130 039 and the coolant temperature sensor will be Bosch part number 0 280 130 026.

The challenge was finding a weldable aluminum bung tapped for an M12 1.5 thread that someone didn’t want close to $50 to ship. That leaves me running the GM style AIT sensor; Delphi part number 25036751. Bungs are plentiful at NAPA so no pain there.

Now I have to solve the temperature sensor to cluster question.

Resistance values are below for the Bosch and Delphi and then there are links to data sheets for all three of the sensors mentioned.

Temp C° CLT Ω IAT Ω
-40 45,313 99,326
-30 26,114 51,79
-20 15,462 28,146
-10 9,397 15,873
0 5,896 9,256
10 3,792 5,572
20 2,500 3,457
30 1,707 2,205
40 1,175 1,443
50 834 965
60 596 660
70 436 462
80 323 329
90 243 238.1
100 187 175.3
110 144 131.0
120 113 99.4
130 89 76.4
140 59.4
150 46.7

Bosch CLT 2782569739

Delphi AIT 25036751

Bosch AIT 2782650379