Chevrolet 1994 Astro Passenger Owner's Manual page 122

Here are things some
owners ask about. None of these indicate a problem
with your fuel gage:
0
At the gas station, the gas pump shuts off before the gage reads full.
The fuel tank will take either a little more or a little less fuel to fill up
than the gage shows.
The gage moves a little when you turn a corner or speed up.
The gage doesn't go back to empty when you turn off the ignition.
For your fuel tank capacity, see the Index under "Fluid Capacities."
Oil Pressure Gage
Standard Cluster Digital Cluster
The oil pressure gage shows the engine oil pressure in psi (pounds per
square inch) when the engine is running. Canadian vehicles indicate
pressure in kPa (kilopascals). Oil pressure may vary with engine speed,
outside temperature and oil viscosity, but readings above the low pressure
zone indicate the normal operating range.
A reading in the low pressure zone may be caused by a dangerously low oil
level or other problems causing low oil pressure.
On the digital cluster, a box around the oil pressure symbol will begin to
flash when the oil pressure
is
low.
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