Ah, yes, another thing. If the car has a transmission amplifier, it'll likely have a 50*C switch ahead of the thermostat where the afterglow temp sensor goes. You might be able to use the EDS temp sensor position on the upper radiator hose attachment if you EGR isn't working anymore, get a dual function gauge sender/glow relay sensor, or fit a sensor on the head in a blank location for which you'll also need an adapter like the gauge sender uses. Or do the purple wire mod.

Sixto
87 300D