How much to repair the governor pressure sensor and governor pressure solenoid ?

Best thing to do is call a few shops from our directory and ask for a estimate and you can locate a shop near you here http://repairpal.com/dodge-repair-in-imperial-california I think the governor pressure sensor is located in the transmission

P1756 Transmission control pressure not equal to target. (Mid pressure problem). SOUNDS LIKE YOU HAVE A BAD GOVERNOR PREESURE SENSOR OR WORSE THE TRANNY IS COMING APART