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 |
