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12v key-on power

iirc there is not much in the under hood fuse box that works off the key other than some of the relays. I had to tap into one of the wires in the harness and run that to a relay which provided a good power lead from the battery.

Something I have thought about doing is having this relay run to an additional fuse block under the hood so that I could have some extra switched power areas under the hood.

a fuse panel similar to this.
The pink wires to the GPR, or FFM or boost solenoid would work.
What are you using the 12v. for?
Any other 12v. ign under the hood I would not tap into.
Unfortunatly there is no auxillary 12v. ign. tap under the hood.
There are some in the convenience center in the cab.
Then use that wire for the signal wire to turn on the relay to Your full on 12 volt fuse panel.
Turn on the ignition and that turns on the relay to power up Your auxiliary fuse panel.
why not just run the hour meter right off this pigtail? Are you just suggesting to power up an auxiliary fuse box for future use?