Oil Pressure Safety Switch
It's always a good idea to place a safety switch in the circuit when installing an electric fuel pump.
Holley has one available under P/N 12-810.
Oil pressure safety switches are available from many after-market suppliers,
but also can be obtained at a reasonable price from your local auto parts dealer under the "Standard" brand PN PS-133,or any equivalent switch for a Chevy Vega.
This switch will ensure that the electric pump will not work unless the engine has oil pressure.
It will prevent the pump from running in a situation where the motor may stall with the ignition ON.
The bypass switch is a conventional bat handled toggle switch in an "off-momentary ON, single pole, single throw" configuration.
Most larger hardware stores have these, or you can obtain them through "Grainger" PN 4X200, "Carling switch" PN 6FA54-73, "Arrow Hart" PN 82270, "Cutler Hammer" PN 7506K4, or "McGill" PN 933002.
Mount the switch in an "out of the way" but convenient to reach location, such as under the instrument panel to the left of the steering column.
Wiring the switch through the starter solenoid circuit energizes the pump on engine start-up.
After the engine is running the switch continues to provide power to the pump as long as there is oil pressure to keep the switch turned on.
