The O/S chasis leg loom contains the wireing for the O/S headlight, sidelight, and indicator, the horn and front fogs only IIRC
The oil pressure and level wires run in the main engine loom that comes down the N/S chassis leg and into the big block connecter behind the headlight, pressure sender has 1 orange and 1 brown wire. Level sender has the same
Water temp is in a different loom alltogether, it exits the bulkhead in the skuttle to the right of the heater fan, and runs along the scuttle and onto the water pump senser. Also in this loom is the wiper motor wireing, washer bottle, and dip dim resister ( if fitted)
Hope this helps