Youll need to touch the needles anyways to move them out of the way, so before you start be at peace with that fact, dont worry the needles move freely. Heres the ring I was talking about
It just lightly clips the face onto the surface so it wont come up and impair the flow of the needle. You can pry it up with a screwdriver if necessary but it will come up when you start slipping sandpaper under face of the gauge. I'll edit it to include this pic, thanks for telling me that part was unclear. I want these tutorials to be as simple as possible to encourage people like you to do what they want
with their car
, so if anything else is unclear, I made a mistate on something, or even if spelling is off please inform me of it.