Many thanks for your most helpful suggestions to my problem with a WTG reading high. When I bought the car 8 years ago I knew the gauge was wrong and ignored it -- relying on the fan to keep it cool -- all OK until recently I had a heater hose leak, lost cooling water and blew the head gasket.
The head has now been skimmed and refitted, new thermostat housing, thermostat, temp. sender and hoses/clips fitted.
This time I replaced the Instrument Voltage Regulator and rechecked Actual vs Gauge Temps. The Gauge was still reading high so I did some tests on the circuit from the sender and fitted a 22ohmn resistor into the circuit --- this has now cured the Gauge problem and it now reads the same as the actual water temp. --- taken from the casing of the header tank. So all is now well but I should have done this simple modification years ago and been in a position to see engine overheating when it occurred.
Many thanks for all your kind and correct advice.
David Thorp --- aka Greenmorgan
