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Temperature Sensors
1/8 NPT, Bosch M 12 X 1.5mm and GM 3/8 NPT temp sensors
Air cooled engines usually use the Racetech sensor provided. This has 1/8 NPT threads and is
screwed into a primer or injector port as shown below. Other air cooled engines may also use oil
temperature. If this was your choice, you’d have a GM 3/8NPT, Dale 1/8 NPT or Bosch 12 X 1.5mm
sensor. Tap your sump accordingly.
Racetech 1/8 NPT CHT sensor mounted in primer port
hole. (Lycoming). This sensor is used for cold start and
warmup enrichment only and will read much colder than
dedicated CHT sensors embedded in the center of the
head. 6 cylinder dual systems use 2 CHT sensors.
When routing the Engine Temp sensor cable to the
sensor keep the cable away from spark plug wires by
at least 1 inch, and never zip tie this cable to the
spark plug wires. There is danger the plug wire could
arc to the temp cable damaging this input in the CPU
Air Temperature Sensor
On Lycoming installations, we supply 1/8 NPT sensors. The air temp sensor needs to see induction
airflow. There are provisions on some throttle bodies to mount these as below. 6 Cylinder dual
systems use 2 air temp sensors. Other engines may use 3/8 NPT or Metric 12 X 1.5mm sensors. Tap
accordingly. When routing the Air Temp sensor cable to the sensor, keep the cable away from
spark plug wires by at least 1 inch, and never zip tie this cable to the spark plug wires.
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