I just finished head gasket repair and re-attached everything. Haven't got it started yet, though. I found this extra plug and need to know where it plugs in. Is on the bundle of wires above the intake manifold and looks like it either goes down through the hole between the 4th and 5th intake port or plugs into something on top of the manifold. The pics in the TSRM are really lame. I have an 89 Cressida. Not sure if there are any extra plugs and wires for the turbo option on the Supra. Please help!