Possibly, the gauges (needles) work off of variable voltage. The little red led probably requires about 3v to work. This variable voltage comes from 2 sending units under the floor. They can also be a victim of corrosion might just need to clean the connections well and check the grounds especially under the dash close to gauges. If that doesn't work, buy one of the pressure sending units and stick it in.
The previous owner of my unit ruined mine with some creative air line plumbing.
Safety: start the coach and let it air up. Should about 2-3 minutes. Then put some shot ring under the front axle. Them dump your air bags. Then and only then work on these air senders.
Before I started, the gauges were showing
150 psi+ and the red lights were on...