I am upgrading my '84 Scag Turf Tiger from a Kawasaki FD750D Carbureted engine to the fuel injected FD851D engine. I routed the return fuel line back into the tank, and I think I've worked out the wiring from the old harness to the plug on the new engine, but I can't find anyone anyplace to tell me what the Map 1 and Map 2 switches do on this engine. Please someone help! Thanks in advance!!