The 1st thing you could do to help us to help you better is either
create a signature that includes your
model/model year/build date info...or add that info to the area that appears in the upper right of your post. You can do this by clicking the USER CP link in the upper right of the page.
Its difficult to make any suggestions because there are multiple air suspensions (EHC I & EHC II)...as well as multiple tire pressure monitoring systems (RDC & RPA). If you create a signature or add your vehicle details...and remember to add any details that may give indication to specific options etc...it helps us to help you better.
Again, we can't make any real good suggestion since we have no clue as to which of the two systems you have for each of the issues you mentioned:
TPS (tire pressure systems) RDC or RPA:
And the two air suspensions systems (EHC I & II)