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Message: [QUOTE="rmc_olderthandirt, post: 1292746, member: 68872"] If you want to protect the engine in the event of a water pump failure then the only place to measure the temperature is at the engine. If the water pump fails the radiator and hoses will cool down considerably as the engine overheats. The best thing to do is to measure the cylinder head temperature. You can use a thermocouple sensor that is like a large ring terminal that mounts under the sparkplug. A mechanical gauge can be self powered from the thermocouple but I doubt that the mechanical gauge would survive the rigors of off road. Here is a website that details mounting such a device on a "paraglider", which has a similar engine setup: [url]http://www.aerocorsair.com/id62.htm[/url] If you could do the same thing except use a digital gauge that has no moving parts it might survive on the handlebars. Rod [/QUOTE]