Clean 12v switched source that is hot cranking and running

I'm running the sniper 4150. I'm running all 12v switched off of a fused power distribution block that has a 100A relay I ordered from Amazon to help power up the sniper EFI when I turn on the master power switch then a secondary I can kill if I have a malfunction on the drag strip. I'll see if I can draw up a basic schematic tomorrow.