Re: 6K/8K Tach
Service parts often don't exactly match production. Fit & function, not appearance, is the over-riding criteria. No telling what they would have shipped if you ordered that part number. Maybe a 6/7, maybe a 6/8. I was a service parts analyst in the industry. Electronic components sometimes vary only in appearance. A supplier often dictates what you can do; they aren't going to maintain parts, production tooling & fixturing indefinitely after a part is no longer used in production. So you pick one version and do a "life of part" buy to cover the anticipated service life of the vehicle.
There is pressure from management to limit obsolete stock at the end of a production run. A family member is the original owner of a very late production '69 Camaro SS L35/4-speed. Built with a 6000/7000 tach. Should have had a 5500/7000; probably ran out.
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