Does anyone know where the engine temperature sensor is on a 1990 +8 EFi? I've fitted the new water pump and lost the temperature gauge. I've found a sensor on the block but nothing is connected to it and there's no obvious loose connector. Presumably the ECU is getting a temperature reading from somewhere. Wiring diagrams for the early 3.9 +8's are non-existent though GoMoG have some on their website.
Thanks

1990 +8 Connaught Green
1970 Lotus Elan S4 SE
1973 Lotus Europa TC/Special