The electric guage I bought from JTATV works great. Easy install.Some of the challenges I've faced when doing this.
My sled is only AC voltage so standard automotive electrical temp guages won't work unless I add a rectifier.
I Mounted the guage in the hood, for mechanical guages the capaliary tube is not long enough to be routed nicely so I had it draped across the engine.
I installed a brass T fitting so I could use both the idiot light and guage from the factory temp sender location. I used all brass instead of mixing different metals together so I wouldn't develop any leaks with metals expanding at different rates.
On super bowl Sunday after about 150 miles my brass T-fitting broke off so my only indicator was a face full of sweet smelling coolant steam. Not fun.
The Factory Guage is designed to be used with AC voltage and it starts at 80 degress instead of 100 so definitely the best option and probably cheapest in the long run since I've probably wasted more money experimenting with different ones.
I found the needle barely ever moved when riding, so I'm back to stock with the idiot light for this season.
My voltage regulator is weak. The replacement one I have coming is for a sled with a battery (p/n 630-105). I'm gonna see if I can create a DC power source off the 3rd wire and leave the other 2 prongs for the factory electrical. Maybe I'll be able to do an electric temp guage, or maybe a DC power source for future use. I guess I just can help myself. I like to tinker.[/b]