Electric fuel pump wiring

Fast340cuda said

I prefer a switch that operates separate from the ignition (through a relay). Helps when performing compression tests (pump doesn’t run while cranking) and priming the fuel bowls before cranking the motor if the car has been sitting a while or the fuel has evaporated out from heat. But either method of wiring will work fine.

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FYI you do know that you do compression test without the ignition and fuel being on anyway on all cars. And your fuel bowls will still fill up with your ignition being on or off the carburetor bowls that are empty of fuel they don't care whether they ignition is or not. And if you want to prime your oil pump weill leave the ignition and fuel pump off and just turn the motor over until the oil pump is primed.