That's the one!

The letters indicate which zone in the seatback you're inflating, I believe that A is at the bottom and they progress up to the shoulders. The wheel is for pressure.

These controllers leak as they age, causing the pump to cycle constantly and wear out. In ~1995 I believe that I paid around $450 for a new pump. I think that I still have the original pump FWIW the nipple is broken off and it's for a '91, not sure what (if anything) else was wrong with it (been a long time).

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Gone to the dark side

- Jeff