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I have an 86 midliner and im in need of a wire diagram for the dash and fuse panel. i think someone hacked it all up. cant get a low air warning device to work for DOT

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Don't have wiring diagram.  You may want to check places like ebay for a Midliner service manual which will be beneficial for other repair work also.

Since you are dealing with a hacked wiring harness, I would probably go old school with wiring a low air switch and buzzer.  You could get your power right from the battery if needed because with a bad harness, I am sure your are disconnecting your batteries.  Power to the low air switch and run wire into the cab for the buzzer.

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