After swapping a 2.25L diesel for a 2.5 petrol engine in my 1983 S3 County 88 the temperature gauge does not work. All other gauges work. The 2.5 petrol engine came from a 1986 Defender. I've checked the wiring to the gauge - all seems good. I pulled both sensors thinking I would just swap them but found that the threads on the sensor from the 2.5 are different from the ones on the sensor from the diesel 2.25. I could purchase a new sensor for the 2.5 ( maybe the sensor is bad), but thought I would ask "the forum" if there could possibly be an electrical incompatibility issue, AND if there is what sensor would I purchase that would be compatible. Really don't want to replace the gauge. Thanks for any suggestions / opinions.