ok well red goes to a 12v power source preferibly on the ignition..you just splice into it. (So the gauge turns off when your keys come out and so that it can reset if it's mechanical) ..... Your black wire goes to ground which is any metal on the car basically....just screw it down.. you probobly want to run your oil pressure gauge off of your oil feed or oil sending unit....you'll need fittings, ask at another forum. as for your wideband 02 gauge I think they are sold at innovative widebands....