Finally i have a sensor in place and working.

If you have a front alternator and an eis this may interest you

I got rhe sensor and magnet from amazon.

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I put one of those inexpensive sensors on my Jab 3300, interfaced with my RDAC/MGL XTreme EMS.  It worked great, but on hot days after being flown and then parked for a while, it would heat-soak and act erratically until the airflow on the subsequent flight cooled it off, but that mean't no stable tach output during the take-off when you need it the worst!

 

I finally bought a Honeywell GT-1 sensor which is rated for 150 degrees C, and it worked perfectly even if heat-soaked.  However, my sensor is located on the rear of the engine and since the Jab has ram-air ducts to the cylinders, it has less cooling flow in that area.  If your sensor is on the front of the engine or has a conventional cooling plenum, this may not be an issue for you.

John

N750A

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