I installed a Remco pump kit on our two Toyota RAV4's, including moving it from one to the other, and the excellent instructions provided made it a pretty straight forward job. The kit includes a pressure switch and a controller/monitor for the coach dash that will sound/display an alarm for multiple conditions, including ones as basic as forgetting to turn the controller switch on or plug in the umbilical cable. We've towed over 40,000 miles with the same pump so far, without a single pump related transmission problem.
Remco has the instruction manuals available on their web site so you can see what's involved.
http://www.remcoindustries.com