[VetteVet]

Hello I see you are getting some excellent help.
Being carburetor simplifies the project because we don't have to worry about primer wiring.

Here's the instructions in case you haven't seen them on the website. i think you probably have though.


Universal Electric Fuel Pump Relay Kit
WARNING! Check for leaks before starting your vehicle.
Installation Instructions:
For best results mount the Fuel Pump Relay in close proximity to the electric fuel pump.
Be sure to route wires in a manner so that they do not chafe on any sharp metal edges and use proper terminals and
connectors at all connecting points to insure proper fuel pump function. Use wire nuts, solder and heat shrink tubing
or crimp connectors to make all of the electrical connections. We do not recommend the use of electrical tape as a
means to make and hold connections together.
1. Secure the relay assembly with the included sheet metal screw. You may use this attachment for the GREY
ground wire if it is making direct contact with a ground, such as the chassis or underbody sheet metal. If the relay
is attached to a plastic or other non-conductive material be sure to route and secure the GREY wire ground to a
known ground.
2. The circuit breaker should be mounted close to the positive 12volt power source.
3. Attach the PURPLE 12-gauge wire from the relay to the fuel pump positive connection as indicated by fuel pump
manufacturer.
4. Attach the 18 gauge YELLOW wire to an independent (Off/On) fuel pump switch, which is powered by a fused
12 volt source.
5. Cut the large 10 gauge RED wire to the necessary length and attach to a known “hot source”, such as the battery
or + lead at the starter solenoid.
6. Attach the remaining length of RED wire between the unused side of the circuit breaker and the battery + source.
Ignition or Yellow 18ga.
On/Off Switch Relay
Grey 18ga. Ground
Circuit
Breaker Ground
Red 10ga. Red 10ga. Purple 12ga.


Ground
+ -
Battey
Fuel Pump
1-800-345-4


I would like to know if you are just wanting to run the fuel pump through the Oil pressure switch or if you want to kill the ignition as well?

If your amp rating is low enough on the pump you could just run the ground side of the pump through the OP switch and run the hot side through the breaker. It depends on the amperage rating of the OP switch. but you might not need the relay. Then you could run your solenoid purple wire to the NC side of the OP switch like 67 burb shows to give you fuel while cranking.

Just thinking out loud here.