Disconnect the lead from the oil pressure sending unit at the block
(beneath the distributor) and ground it to the engine block. That should
simulate the loss of oil pressure and light the warning light on the
dash. The oil pressure switch is a set of contacts that connect to the
ground of the block and are held open by oil pressure. Once the pressure
drops, the contacts close and a ground is available to the warning light
that is connected to positive voltage on the other side.
This is also a circuit that some people tie a relay into to shut off
electric fuel pumps if the vehicle is in an accident and the engine stops
to prevent chance of fire.
-Vegaman Dan
--
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