Oil Warning Lamp at 2k rpm's

[Sean Shoemaker]

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Now that I finally had a chance to test drive my '84 CGT I found a problem.=
  As soon as I hit 2k rpms on the tach the oil warning lamp comes on and th=
en goes back off when the rpm's drop.  Several theories abound, from a clog=
ged pickup screen to a faulty sensor.  Any known problems in this area.  I =
would just like a way to narrow the problem before I go dropping the oil pa=
n and my brand new 20W50.  Also I have a factory analog oil pressure gauge =
in my console and it is pegged at 5 bar anywhere off idle.  TIA for any hel=
p=2E