Since the sensor on number 3 isn't needed.
If we use a regular injector in #3
on an ALH
is there an injector line we could use for it?
Maybe from a AAZ?
I don't think there is any bolt-on option. You can, of course, bend the metal line to fit the shorter injector. I've always gotten injectors in sets of 4 so it hasn't really been of issue.