This is on a Luscombe 8A no starter so must hand prop. A&P says disconnect the oil line from the gauge inside the cockpit start the engine and when the oil starts coming through connect it back up to the gauge when the oil begins coming out. Told helpers needed and a mess to clean up as I probably couldn't do it alone. I thought maybe I could just disconnect the oil line from the gauge and fill it full of oil from inside the cockpit and connect it back up to the gauge and then hand prop it. Is that likely to work?