I'm wondering which sensor to hook my new electrical water temp gauge up to? There is one on the top of my radiator, and one in my engine filler neck. Are there any others, or somewhere else I should hook it up to?

Thanks

 

If it's an aftermarket gauge, it should have come with its own sensor. If not.....its useless imho.

 

the one on the radiator is the coolant level sensor

 

It's a tough one, I've been debating it for 4 months, still haven't hooked it up.

 

The stock temp gauge sender is on the rear plate under the oil filter. It's a small sender next to the much bigger oil pressure sender. If the sender that came with your gauge has the same thread as the stock sender you should put it there. Otherwise you'll need to find another location.
If your car does not have the optional auxilary electric fan installed in front of the A/C consensor you can use the location on top of the thermostat housing. This normally holds the temp switch for this fan, but if you have no fan you don't need that switch.