oil pressure sending unit

[Edward R. Wendell IV]

Sorry to disagree with you Huw but BTDT just recently on an 89 200tq:

The 89 and up type 44 chassis has a different dashboard with some extra 
gauges including oil pressure but the block still has only two oil 
pressure ports. These two ports were previously occupied by a low 
pressure switch (closes below 0.3 bar) and a high pressure switch 
(closes above 1.8 bar). Both feed into the auto check computer along 
with rpm. If the auto check computer doesn't see the correct switch 
opened/closed at the correct rpm you get the oil pressure warning 
symbol. When the oil pressure gauge was added VDO invented a combined 
the sender for the gauge and the 0.3 bar low pressure switch in one 
housing so as to maintain the auto check functionality while providing 
the signal to run the gauge separately. The two contacts on the oil 
pressure sender/switch are labeled accordingly as G for gauge and S for 
switch. The high pressure switch (white body) stays unchanged.


Roy Wendell
Clarksburg WV USA
86 5kcstq- currently being stripped
87 5kcstq- currently being resurrected
87 MR2 times 2
Three turbos, two quattros, too much fun