Fuse to tap for switched power?

Does anyone know which fuse (and location) that I might be able to tap that will provide power only when the truck is turned off? I have a '22 SR5 DC and was thinking about adding an alarm LED and need power only when the truck is turned off (key removed).

 

You’ll need to wire up a basic 5 pin relay to a hot-only-when-on fuse, but wire it normally closed instead of normally open

 

Tap the 16-pin connector in the back of the HVAC control. Purple wire either pin 12 if you have standard HVAC controls or pin 6 if you have dual-zone. It controls the security LED on your dash. It’s a return, so give your new LED a constant 12V(+) supply and connect the return wire to the tap on the factory connector.