Re: wiring of oil pressure gauge
are you using senders for oil warning light or for gauge ???
the light senders work the opposite way to gauge senders and will make the gauge read full at no preasure.
you can buy a VDO gauge sender at most auto shops ( repco, autobahn etc), should fix it
the other thing that could be wrong is it the wire that goes to sender has been squashed and is earthing out.
`75 XB FAIRMONT SEDAN injected 351, toplaoder, disc brake 9", factory paint+ vinyl roof.
`03 BA XLS ute - lpg, auto, lsd, acid rush paint,