Water Temp Elec. Gauge Hook Up.

Whats up guys does anyone have a water temp gauge hooked up to there 4v. I don't know where is a good place to hook it up. I went to a speed shop and they told me i'm going to need something special to hook it up.

I need this because my stock gauge is broken and i'm having cooling problems. Coolant keeps coming out of the tank. The light stays on now for the coolant. I added some and it doesn't want to go away.

I don't want to blow my motor or a head gasket because of this stupid crap.
 
Well see i'm beginning to think the senser or something is messed up. DAMN IT YOU GOT ME ALL EXCITED THINKING SOMEONE ANSWERED MY QUESTION. "NNoooo i have to fix the coolant problem first." I know this that is why i need a reading somewhere. LOL

Now do you know how to hook up the gauge??? =)