As we all know the only way to install the optional oil pressure gauge is to replace the oil pressure switch with the much fatter oil pressure sender. this cannot be accomplished without cutting the sheet metal or extending the hole out of the sheet metal and attaching the sending unit. this hose will give you the needed length. (might need to grind down the male end for a proper fit)

Note: dual sending unit sold separately, part number rvdo360023 or rvdo360006.