Possible Thermostat Issues?

[ImperiumRex]

Hello

I'm new here, so sorry if this is posted in the wrong category.

Last week, I was warming up my 03 Outback, to change the oil, using a fake-a-lake in the driveway. After running the engine for 5-7 mins or so, I noticed the temp gauge had dropped back to its starting position (it was nearing operating temp before the drop). I cut the engine off, and wiggled the wires around the thermostat, to see if maybe I had knocked them loose. Still no change. Any ideas?

Thanks for the help in advance.

[DOCDRS]

could be your gauge, try wiggling the wires on it, or check to se if there is a signal going to it with a voltmeter....not sure what it is ohms or what the value should be, someone may chime in, Also not sure how your dash is controlled that year which mdc unit.