" Are these stock temp sensors compatible with most gauges, specifically the EM-2 (Tracy?) ?   If not, how hard is it to find the correct sensors that will screw into these metric holes (in the US)?   Does anyone know what the thread size of these holes is? " 

 

Based on tough experience, choose the Gauge first.  It will determine what kind of sensor it is happy with.  Not all sensors will work for any one gauge.  The Grand Rapids EIS uses some sensors that require a resistor wired in to give the proper reading,  also 'exciter' power is needed to some.  Tracy's system will doubtless require specific sensors just like the other makers.  Wait and see what is needed then buy the sensor.

 

JC Whitney sells a little package of metric to NPT adapters that you will need to fit the NPT sensors to the metric block.  These are cheap, so buy 2-3 packs.    As I remember off the top of my head, they are 10mm fine (?) pitch male to 1/8" NPT female.

 

Tommy James<><