I put in a flow scan about 2 years ago, not diffucult to do, not difficult to dial in, easy to use. I like it, I believe it is pretty accurate, I never trusted my gas gauge. There are several models, aside from different one's for different applications, check them all out for what you need or like before you buy. There are also D.F. & G.P.S. Manufacturers that incorperate fuel management systems with there stuff. If you haven't gotten & are in the market for any of these electronic systems, look into this too, it may save some money & some dash space. Good Luck, Joe