Just get one of these and you never, ever have to flip the donut over to check tire pressure...Checking the air pressure (60 lbs.) in my spare, every 6 months, is difficult.
The plastic surround is tight against th tire and I have to fold down the seats, to be able to wiggle the tire out.
It's at this point that I can flip over the tire and access the valve stem.
I installed this in just a few minutes....