Early system Late system
Hover over a wire to confirm the colour
Early system - unstabilised:
Note: The gauge earth is required for its correct functioning as well as for its illumination.
Late system - stabilised:
Oil and temp gauges only applicable where electric units are fitted in place of capillary units.
For the first year of the North American padded dash and electric oil and temp gauges (Mk2, 1967) instead of a light-green/green wire coming from the instrument voltage stabiliser to the first gauge (fuel) it is shown as a green wire. This wire then daisy-chains to the oil gauge as a light-green/green, then daisy-chains from there to the temp gauge as a green again. After this first year the schematics are as above i.e. only the fuel and electric temp gauges are fed from the stabiliser, the oil gauge is fed with a full 12v. Apart from the different wire colour the oil gauge being fed from the stabiliser could have been required if a non-stabilising sender had been used for just that year, but the Parts Catalogue doesn't show that. Certainly the later sender was an industry-standard device which included its own stabilisation function as well as pressure transducer. Therefore it either was connected to the stabiliser, erroneously, or it is an error on the schematic. With two separate stabilisation circuits in series I would expect the oil gauge to read low, meaning that perhaps it is just a schematic error.
North America reverted to a capillary oil gauge in 1972 for the remainder of production.
UK always had a capillary oil gauge, and the temp gauge only became electric in 1977.