To fix this correctly, you will need to have this piece chrome plated.
This is what my machine looks like. There is a long black decal that is just above the warning track, PBResource has this decal, part #31544B. However, this will not cover all of the damage that your piece looks to have.
Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside