Holley also makes an oil pressure activated switch designed specifically for fuel pump applications.

Holley Switch

The nice thing about this switch, is that it has both a normally open and normally closed set of contacts, which facilitates the addition of a priming circuit.

On my truck, I replaced the two position ignition switch with a three position switch, and wired the normally closed contact to the crank output on the switch. This provides an easy way to prime the system if the truck has been sitting for extended periods of time.


Best Regards....

.