Had trouble putting air into my inner wheel and getting an accurate reading. Part of the problem was a defective air chuck. Lowels was reluctant to replace it, but they did. (bad reviews on ones with dial).
I also found out that the 10" valve stem extension from inner wheel was not acccepting my air chuck all that well. The FRONT wheel valve stems (without extensions), did accepted my new Lowes air chuck and one other one that I had.
As I recall, I had the same problem on my 1st. MH. I went thru 2 or 3 different guages before figuring out that it was the odd ball extensions back then.
So I will do the same thing on this MH as the first MH. Replace the extensions with the Les Schwab brand.
Don't know the brand of the bad extensions that are on there now. I guess bad extensions just follow me around
Just a thought