It has been years since I fooled with the old LA TBI setup and it was on a stick truck.

That said, what I remember, and it's been decades so take a grain of salt, the computer used it's own sensors and the gauges used the normal old school setup. IOW the gauges don't need the computer to function.

I do want to say the computer has some control over the auto trans though. Lockup and OD I suspect there are workarounds for that. Such as this setup.

As for the fuel pickup, I would pull the pump out and replace it with a bit of tube and a sock. But to be honest I think the mechanical pump will pull thru it anyway. Fuel gauge will still work as the sender is separate. Fuel tanks for this vehicle are virtually nonexistent anymore so be careful.

You will need to wire in the older voltage regulator as that is one thing the computer does control, you can keep the existing alternator.

Will need a new intake.

That's all I remember for now