Complete rewire.... What have I forgotten...

Hoping for some reassurance!!

Im about to rewire my early Subaru race car which was a terrible "used car" kinda wiring setup. Its a mess and it's time to start again.

I have the main EFI loom pretty sorted. Just curious on what else in the engine bay requires power or a earth.

I figure for 12v+ for

-Ignition coils

-Injectors

-Alternator

Do crank and cam sensors need anything special other than shielded wiring and ran back to the ECU.

I plan to have a 5v and 12v bus in the engine bay for future expansion.

Am I forgetting anything major?!

Cheers