Over the last few days I have been trying to work out the vagaries of the wiring. I recently fitted the Moss Hazard Warning kit which switches off the indicator flasher when the hazards are on. Noticed that the water temp gauge (a single electrical gauge added by the PO) was turned off when the hazards were on. Eventually established that it was powered through the indicator flasher rather than through a voltage regulator although I couldn't establish where the connection was made. I ran a separate wire from the indicator flasher to the indicator stalk which sorted the original problem. I have now ordered a voltage stabiliser (https://www.autoelectricalspares.co...positive-earth-bottom-bracket-3831-p.asp) so I can power the gauge correctly.

1956 Plus 4 4 seater