Allright, it seems that when i get one problem fixed another comes right up. Maybe i should stop putting stuff on my truck, but i dont see that happening

. I installed nu image white face gauges on my truck the other day and had everything back to normal. when i started up and and began driving around this morning, i noticed my temp gauge(bottom left hand gauge) wasnt moving as fast as it normally did, if at all. Then a few miles down the road it quickly shot up to the halfway mark where it normally sits at driving conditions. I checked the gauge and it seems nothing is obstructing its movement. It doesnt really bother me, but if i could get it fixed id like to. Like i said it does work, it just pops up after a few miles. Im going to check it again tonight after i get of work here and see if i bent the needle behind the gauge needle (if that makes any sense)or placed it out of allignment or something. Then again i dont think that would be the problem if it pops right back up after reaching normal heat. Thanks in advance for any input you guys have.
Jake