oddly enough i found a set of vdo gauges [oil temp' oil pressure' and volts]on top of a dust bin!!. i fitted them to my type 2,used a dip stick sender[for temp] the two terminal sender for oil pressure and oil warning light[both vdo].i now have fitted the two terminal pressure sender to my t25,i fitted it in place of the low pressure switch,i havent wired up the gauges yet, but in your case you only need to run one wire from the sender to the gauge.hopefully someone will post where to fit the sender om your van[petrol?].
good luck.
I dont think, so I'm not[do I exist?]
1992 1600td [ jx ] syncro panel van[leisuredrive camper ]
! but didn't know if it would fit watercooled T25 engine & if it did which sender it would replace. 