Low QTC Oil Pressure

[Andrew Finney <afinney@tamsconsultants.com>]

So I put an oil pressure sender from a 1984 Coupe into my
1983 UrQ. Teed in w/ brass and teflon tape to retain the 0.3
bar pressure switch. Ignorance was bliss. The gauge reads 1.2
Bar at hot idle and 2.5 bar at hot high speeds. This doesn't
sound good. All my other Audis had super high oil pressure. 

Choices: 1) bad sender - how do I check this?

2) Very bad things that I am scared of. 

Anyone have any thoughts out there. Could this be a problem
with combining the pressure gauge and pressure switch in the
same place. One circuit grounding through another? I posted a
question earlier this week and got no response. When I
disconnect my pressure switch the oil light doesn't go on. Is
this OK, or does it act in reverse, grounding when pressure is
below 0.3 bar? Help.

Andrew Finney
1983 UrQ.