[Mgs] Oil Pressure question

[saidel at camden.rutgers.edu]

Anybody have an idea where the fault lay when the oil pressure gauge  
indicates only the transition pressures?

That is, going at a comfortable and constant speed, the oil pressure  
gauge indicates just above 0, but changing gears the gauge jumps up to  
a nice position.
For you ee types, the gauge reads the AC but not the DC.

Is this most likely a gauge effect or a pressure sender effect?
It is not an oil quantity effect!  The dip stick is happy.
TIA,

Bill S.
BMCSNJ
'74B
'76B