George, it took me about 5 hours to install, they make two systems for the Dodge truck in your year, the Express is the simple one, when the tank gets down to about 1/4 mark, the pump automatically transfers to the factory tank, when it reaches about 3/4 full, it shuts off, there is no gauge reading for the AUX tank, this is what I had in my 05 Ram, I just went by miles driven and had a close idea what fuel was remaining, a simple system. The other system they have is the Trax 2 system, it has a module with LED reading, shows how much fuel is in both tanks, and some other stuff. If you buy one of these systems beware the first one I discused will not work on a 2010 and newer Dodge, the tank gauge wiring has changed, only the Trax 2 will work. So if you decide to replace your 05, you have to buy the Trax 2 kit. The install on the Trax 2 is a little more involved, add a couple of hours to do that one, I have done both, I retained my 70 GAL tank when I sold my 05, and bought the Trax 2 kit to add to my tank for the 2012. They want in the instructions the Module mounted in view of the driver, I found no need to always know what the fuel in the tanks are, so I mounted it inside the glove box, if want to see it, I just open the door and look. One other thing about the Trax 2, is say you fill up both tanks, the module will show 70 gal in the aux, and 35 gal in the factory tank, when your factory tank gets down some maybe 5 gallons, it will transfer to the point that the main tank is at the same % of full as the Aux tank, so as you driving along and your main tank Factory gauge says it is at half full, the Aux tank will be the same, half full, I like that a lot, also when I installed the aux tank, I installed a Marine Racor 2 micron fuel filter between the aux tank and the transfer pump, now all my fuel gets 2 micron filtering, and it has it's own water seperator also, pre filtered fuel before it enters the mail tank, I hope this helps.