autometer water temp gauge not working right?

anybody know whats wrong with my temp guage?

what it does is: when the car is cold, it will take about a minute for it to shoot up and peg out (it will go passed 250*). when its warm, it stays pegged out. i checked all the wires and everything seems fine. so im thinking it might be the actual temp sensor or the guage itself...what do you guys think.....ohh yeah, the sensor just started acting up all of a sudden
 
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If you figure this out please post up the solution.

I tried running the stock gauge and autometer off the same sender, just to see what would happen, and I saw what you described in your first post. Took off the stock gauge and everything worked fine.

I then switched to a stock ford sending unit and got the symptoms you described above, so I was thinking I just needed the autometer sending unit. But maybe thats not the case.

What ground and power wire did you splice into?