The coolant temperature sender supplied by BMP can be threaded into the cylinder head. The Bentley manual indicated the location of the fitting incorrectly. I found the intended location but couldn't get a wrench on it without removing the intake manifold. In an ideal world, I'd weld a bung to the thin aluminum thermostat housing and thread the coolant temperature sensor into it. In this world, I'll probably just do what SCC's Dave Coleman did on his rally car: insert a tee fitting into a radiator hose. I couldn't source one between the time I settled on this solution and deadline, but Dave said the Autobacs store not too far from our office has the fittings.