Diesel Pusher Air Filter change

lj2654 wrote:
I was wondering how to really know when to change an air filter on a CAT engine.

I have the vacuum gauge that is supposed to give you the info but how reliable are they?

The filter for my engine is a large canister that has to be changed out but its more awkward to do than hard.

I can remove the lower hose and visibly see it but that doesn't tell me anything!

Last time I saw mine, it looked like new, but have been on a very dusty road since then for quite a few miles. My plan is to just use a shop vac on it and maybe blow some air through it, as well.
Gauge still says it's good to go, so.....