Too funny, I JUST dealt with this a few days ago. I had a digital pressure gauge and I couldn’t connect it to the valve. I kept trying and trying by the time I was done, I think I removed about 10lbs of pressure. I had to go to my nearest mechanic and get an old school manual pressure gauge, the type that is just a long tube with the white bar that pops out the bottom. It has a 45 degree tip on it.

As for filling it, I just used a 45 degree tip on the end of an air compressor. It worked pretty good.

I found if you place the wheel so the valve is either at 4 or 8 o’clock it’s easier to access the valve stem. I use a 6” airchuck with a 45* tip and an old school gauge w a 45* tip

I found that Tom’s advice about 4 and 8 o’clock works the best.

You can remove the outboard fairing attachment bolt using a 5/8 socket wrench and the fairing will lift up enough for access to the valve stem for checking and inflating the tire.

It also helps to put a stripe on the tire so that when the stripe is on the bottom of the tire, the valve is down for air. FYI