I am not sure if anyone sells the decal so you might need to work from a photo of another set, and make your own decal or have a sign shop help.
Think I have a new dial pointer like that if you need one.
The hammerite paint would be a really good match I think , if you look at this link, at the brown, dark blue and deep green. I think if you look into it you’ll find that the bumpy texture and the colors closely resemble the few colors that NE put out in this Era.
otherwise now that it’s glued together you can probably treat it like auto body work and use bondo, glazing putty, primer and auto paint. I did one a while ago using basecoat clearcoat and it came out super nice, but the metallic paints do present a bit of a challenge for spraying, make sure to do thin coats and shake the can well.