[Yooperforeman]

I think with any air-cooled engine that cylinder head temp. is very important,too hot and you're going to be scoring pistons and cylinder walls.

 

[Yooperforeman]

I bought a head temp. gauge from jegs.com.It is made by VDO and is simple to install.The sensor gets installed under the sparkplug(however,I installed mine under a head mounting bolt)Normal operating temp is around 350 degrees,the fan kicks on somewhere around 375 degrees.

 

[Yooperforeman]

It's JEGS part no. 918-310901(VDO cockpit style head temp. gauge)

 

[Yooperforeman]

Your welcome,I didn't know how to make a link to it...You can go to JEGS.com and enter that part number in the "search" box.

 

[Yooperforeman]

I was worried about water getting in it too,so I sealed around the bezel and around the back of the gauge with silicone.So far it has worked.