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Except for potential maladies that may have been introduced by previous wiring "repairs," a factory tank selector harness should make the addition nearly plug-n-play. See Fuel selector switch and the 1983 Wiring Manual for more details.Reiterating, the fuel tank sender hose connections are:3/8" = fuel supply from tank to pump5/16" = fuel tank vent to vapor canister1/4" = fuel return from fuel pump (application specific)If the fuel pump has an application specific 1/4" hose nipple for fuel return to the tanks, plus the standard 3/8" fuel hose connection from the tanks and one 3/8" steel line running to the carburetor, the tank selector valve needs to have six hose connections, three 1/4" nipples and three 3/8" nipples. If the application specific fuel return line to the fuel tanks is absent (only one 3/8" fuel supply hose and one 3/8" steel line are connected to the pump), the selector valve requires three hose connections, all 3/8".