It seems to off by around 50 degrees or so.. Am I supposed to pull the temp knob off? How would I even get that off to adjust it?
http://www.truckmountforums.com/steam-way/4391-powermatic-temp-question.html This is the same proceedure except you will need to look at your pressure gauge and the temp guage to make adjustments. Pressure drops 50 psi when your solenoid opens. Also, I learned a trick from Rob Allens brother. Drill a tiny hole in the thermostat knob so you dont have to keep removing it. Removing the knob and putting it back changes the settings if your not super careful. Your on your own with this one. Don't blame me if you mess things up because its a little tricky.
The numbers on the dial are not calibrated super accurate. For my truckmount, I just knew it was off by between 40 and 50 degrees and set it accordingly.