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The fastest way is just to crawl under and mark 10degrees witha peice of chaulk and a straightedge.
I've thought about doing a light sand and then going over it with chaulk to 'reverse highlite' the area, but I never followed thru with it. Also thoughtof PB Blasting the area after sanding and then painting over the area, once dried resand and that should leave the numbers with paint and the balance back to metal but I never follow thru with that one either.
Being lazy has its moments
Tim