I have a fuel milage gauge, It's called a Fuel Tach. Looks like it would fit in the center tach hole on the dash. I bought it for a big rig. It has flow sensores that hook into the fuel line, and a electronic speed sensor that you run off the speedo cable. You set it up, figure out you fuel consumption and then calibrate it. It also has a small digital read out. Looks cool, but I never got around to running it.
