Just ran into this on fleabay, and I ordered one, I'll report on how well it works but is pretty neat for $20 It has clock, in/out thermometer with remote, 70C max (158F) but the cool thing is: it also displays your battery voltage with a HIGH 15V AND LOW 11.5V warning light and buzzer. How cool is that? I will whack off the cigarette plug and wire direct into the headlight shell but anyway what a cool little toy and useful info all in one small package. I thought I would mount the remote temp under the gas tank or on the bottom end somewhere maybe back by the tranny. it should give a rather good proxy of how hot the engine is running. It will be a bit hard to read cause the display is small overall length is 5 1/4" but nice info even if only when stopped.
http://cgi.ebay.com/ebaymotors/Digi...r_Truck_Parts_Accessories&hash=item336882b800
http://cgi.ebay.com/ebaymotors/Digi...r_Truck_Parts_Accessories&hash=item336882b800