check oil light

[JKLedbetter]

From the service manual:

"The oil pressure warning light works in two ways. It
will flash continuously following a momentary loss of
oil pressure, or it will go on and stay on with a complete
loss of oil pressure.
When the engine first starts, before oil pressure rises
above 29.4 kPa (0.3 kg/cm2, 4.3 psi) current flows
through the oil pressure warning light and the oil
pressure switch to ground. This tests the circuit.
With the engine running, voltage is applied to the flasher
circuit of the integrated control unit. With normal oil
pressure, the oil pressure switch is open and the oil
pressure warning light does not operate. If the oil pres
sure switch closes momentarily (more than 0.5 seconds),
but then opens again, terminal "A7" will sense ground
through the switch. The integrated control unit will
then provide and remove ground for the oil pressure
warning light through terminal "A7". The light will
flash on and off until the ignition switch is turned to
"Off."
If engine oil pressure falls below 137 kPa (1.4 kg/cm2,
20 psi) and does not increase, the oil pressure switch
will stay closed. The oil pressure warning light will go
on and stay on."