I never would never wire the on/off switch like that.it should be wired underneath the dash.
Not sure who your replying to...
If it was this reply, maybe you should read what he said.
70HemiGTX
I have mine mounted on the inside of the rear frame rails along side the fuel cell. I have filters mounted to the rear frame crossmember between the cell and pumps. As you can see the pumps are lower than the cell, so I have gravity feed. I have the relays inside the trunk and run the main feed off the battery cut-off switch. I have the switches in the dash and plummed through the oil pressure cut-out switch (Holley if I remember correctly). It only takes about a 3 amp fuse for at the switches. Wire it as safely as you possibly can!
If you're referring to the switch in the pic it's a battery disconnect which is required at the track if you have a trunk mounted battery.
From your replies, You just might be better off paying someone who actually knows what they're doing to work on your car.
