4kq low oil pressure light- help!

["Erik Addy" <erik@aero.und.edu>]

Car: '85 4kq, apx 140k miles

Situation:  I'm on about the 200th mile of a 300-odd mile trip on the
interstate
when the low oil pressure light/buzzer goes off. DOH!  First reaction was to
put
in the clutch, and the light went out.  I was about to get off for
gas anyway, so off I go.  Oil full, light stayed off for the rest of the
trip.
Got home and did an oil change, as it was due (Mann filter/10w30 Mobile 1).

Light comes on every drive now.  Only when cruising between 2-3k rpm.  If I
lug
it in 5th at 40mph, no light.  I can steadily watch the light start to glow,
and
get brighter till it suddenly buzzes.  If I put the clutch in (and let off
the gas)
light goes out, then repeats a minute later.  If I put the clutch in and
keep the
revs the same with the gas, light stays on.

My gut feeling:  Electrical problem, it _is_ an Audi, you know (and you
thought
Lucas was the only prince of darkness).  Anyway, I think electrical becuse I
get
no lifter noise, no increase in oil temps, and everything generally seems
fine
except the damn light.  Plus, why would the light go out when the RPM's
_decrease_?

Possible cause:  I did remove the tray assemble below the steering wheel to
run some
speaker wire for new door speakers, perhaps I loosened something?  Still,
didn't start
untill 200miles into trip...

Request:  Any troubleshooting tips.  It's cold outside, and I am really
busy, so
anything that helps me find an awnser sooner would be much appreciated.

Thanks,

Erik Addy
erik@aero.und.edu
Grand Forks, ND (and Minneapolis, MN)
701.787.0450

89 200tq       PP-ASEL (soon Comm-MSEL-IR)
85 4000q       SPC-4, NDANG, formerly USMCR
QCUSA