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I'm putting a Holley 12-810 pressure switch on my rig. The instructions are fairly straight forward and simple. The only real thing is finding the proper voltage wires for each connection. 12 volts required.
For the record mine is a stock 78 F150.
I am not familiar with the Sniper specifically. That said, FI setups usually control the fuel pump through a relay triggered by the ECU. The ECU is the safety device. If there is no RPM signal the fuel pump is shut down after a few seconds.