What part numbers should I use when purchasing temperature sensors for MS?

For the most part, MegaSquirt can utilize all stock sensors. MegaSquirt ECU's with MS-II processors can interface with all stock sensors after a few calibration steps. MegaSquirt ECU's with MS-I processors can theoretically interface with all stock sensors too. In practice, however, the calibration steps for using non-standard IAT/CLT with an MS-I based ECU involve antiquated and difficult to use software. We recommend either using standard GM IAT and CLT sensors for use with all MS-I based ECU's.

You can purchase IAT and CLT sensors direct from SymTech Labs:


Conversely, you may be able to find these standard sensors from a local parts store, or a junkyard. See the tables below for part numbers and applications:


Known Applications Years
All GM (Chevrolet, Pontiac, Cadillac, GMC, etc.) 81-96
Honda Truck 94-96
Isuzu Truck 92-96
Jeep 82-87


Manufacturer Coolant Temperature Sensor (CLT) Intake Air Temperature Sensor (IAT)
GM 12146312/15326386 25036751
Standard TX3 AX1
GP Sorensen TSU81 779-19001
AC Delco 213-928 213-190
Niehoff DR134AK TS83631/DR-136W
Wells SU109 (includes connector) SU107
MSD 2310 (includes connector) 2320 (includes connector)


Supplier Coolant Temperature Sensor (CLT) Intake Air Temperature Sensor (IAT)
Wells 254 235
NAPA ECHTSC200 ECHTSC300
Niehoff PS77421
Conductite/Dorman 85100 85110
AutoZone 047131



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megasquirt/sensors.txt · Last modified: 2017/10/10 03:45 (external edit)
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