Help with seat leon 2009

Hi, just wondering if someone can help me.

I have a seat leon 2009.

Recently my reversing sensor's have been playing up, sometimes they work and sometimes they don't, or even they sound when i put it in reverse but then don't sound when close to something when reversing, can anyone help me on this?

also on the dash panel display, where it shows how many miles left in the tank etc. That now doesn't light up, any help?

but the rest of the panel does like the speedometer etc.