I cannot think of any reason why one would have two oil pressure switches for one fuel pump unless a PO was trying to eliminate that tangle near the fuel pump. I suggest you start over with your own design knowing that it is only necessary to ensure that the fuel pump stops running when there is no oil pressure (that is, engine shuts down but ignition switch is still in the "on" position). I would go with the front switch and eliminate that thing that you had so much trouble getting a picture of. A wire from the "ign" on terminal on the key switch to one blade on the OPPS (either) and a second wire to pump+ should do it. If you need a "cranking" override we can discuss that later.
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