88 thunderbird turbo trouble codes

hey,
i am looking for a friend without a computer
he has a mustang withan 88 turbo engine 4 cyl in it
he is throwing lots of codes, I found most of them,
car off 18 23 27 42 81 82 83

car on 23 34 74 77

bu there are a few that are tricky.

18 Loss of TACH input to ECA; SPOUT circuit grounded
dont understand it

81 Air Management 2 circuit failure (5.0L only)
82 Air Management 1 circuit failure (5.0L only)
i dont understand why they would be throwing these either.


any input on anything would be helpful
thanks
Joe