Hi Steyning,
Sounds similar to the setup I had on my 7 (1.8 K series) , except I have standard wet sump.
I got the oil pressure light on the dash to work by including a low oil pressure switch , which I mounted into one of the blanked off fittings in the oil filter housing (after removing the threaded blanking plug), to this switch I connected the black/yellow wire. I assume that upon loss of oil pressure the switch grounds the black/yellow wire and the light on the dash comes on.
I pretty sure the wire from the VDU sender unit only goes to the oil pressure dial and is not used for the low oil pressure warning light.
I purchased the low oil pressure switch from Think Automotive. Not sure how this would work with a dry sump setup.
Cheers
Chris
Edited by - Chris Norman on 7 Aug 2008 08:54:37