The flap on the crossover pipe actuates at low rpm and the flap on the intake actuates when rpms exceed 3500. Hook up a long piece of vacuum hose to the crossover flap and lay the crossover on top of the engine. Connect one of the electrical plugs to one side of the switch and start the engine. move the throttle linkage and watch the flap on the crossover pipe. If it opens at a low rpm, you've got it right. If not, plug the connector into the other side of the switch.

__________________
2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900