Drawing from the Leyland Workshop Manual, with errors. As shown, with the contacts open, the gauges would never work as there is no path for 12v to pass through to them and the senders. The contacts should be drawn closed. Also the colour of the wire(s) from stabiliser to gauges is light-green with a green stripe, i.e. 'LGG', and not 'LG' a shown.

Drawing corrected, with arrow, showing direction of movement of the contact on the bi-metal trip.