Remove and discard the stock ashtray. The fuel gauge (supplied by others) drops through our 1/8" brushed aluminum plate, which also accepts a switch for a 6-port valve or other 12V device (and the plate is available as a special order, same price, with no switch hole) and a 3rd hole to reinstall the stock 12V outlet. Requires that you drill 4 holes and fasten the plate with 4 stainless steel sheetmetal screws (which we include.)