Any adjustment to the pressure for the tag, assuming it is still 'user adjustable', should be need the solenoids for the drive and tag axle. On the early 1990's models these were in the engine compartment and the solenoids for the front axle were up under the front of the coach on the drivers side. They should be easy to spot as they are located together on a manifold with air lines running everywhere.
Let us know what you find. I enjoy finding differences in locations and functions of accessories through the years. Especially since most changes were not made at the beginning of a model year.
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