The original tanks were typically a nickle-terne finish. Spectra tanks are usually the same finish. The straps were typically galvanized or zinc coated. I use Spectra or good original tanks, and I prime and paint all of them gloss black. I also do the same for the straps after removing and treating any rust. Originals were not painted although they might have undercoating on them. The sending unit is grounded with a strap connecting the fuel lines though the fuel line to body/clip contact, although some ground might be achieved via the lock ring to tank to strap to chassis contacts. I add an auxiliary ground wire to the chassis to ensure a good ground. With all the paint, coatings, any corrosion, small point contacts, etc. the added ground is more assured.
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