67 Dart 270...Project Old School

I swapped in an even longer set of pushrods in hopes of quieting the valve train. These ones were 6.881" long. I also took the time to eliminate the double valve cover gaskets that were leaking. This meant I had to grind on the Mopar Performance valve covers to get them to clear the intake runners. I also put some gas in the car and it looks like something is not right with the digital gas gauge/sender setup. After I filled it up it read ZERO. I had my suspicions because I started with 50-60% fuel and then it slowly rose to 75% as I drove it. When I filled it up I only got in about 8 gallons or half a tank of fuel. Either I set the DIP switches for the gauge incorrectly or I installed the fuel tank sending unit upside down.