Original builder Chad Robinson intended to install an auto engine and run auto gas. He modified the build of the tanks. All of the work had been removed from the plane when I received the project. The remaining differences are 1) Each tank was built with 5 extra openings through the strake, intended for electronic fuel level sensing using magnetic reed switches, all spec'd as ethanol- resistant. 4 are on angle and sealed by BID. One is at the floor of the tank and holds the stub of a switch intended to track fuel level in the sump. All openings are 1/2" male with a brass pipe thread. 2) The tank sump was made extra large - at least 2 quarts larger than standard. Where the standard Cozy holds 29 gallons each side, #1147 holds 30. 3) The tanks are lined with ProSeal. 4) Chad had installed fuel sight gauges using an ethanol-resistant backing plate of polyphenylene sulfide. I removed those gauges and installed the Vance Atkinson standard, which uses an aluminum backing plate. The Vance package comes with an LED, which I have wired to come on with the master.