B&W Companion is great. Since you already have the turnover ball mount installed it's a logical choice for you. You'll love it.
The computer is getting confused on your fuel level. You can install a 12v solenoid valve in the feed line. Leave it off until the fuel level drops below 3/4 or 1/2 and then turn the feed on. The computer will not lose it's mind this way. I also have a manual shut off at the aux tank that I leave off when I not going to be using the aux tank. My computer is very accurate and when I fill up the fuel used reading on the computer is right on.
