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I don't think the difference in the readings is enough to matter. Could use dish soap or glycerin to lube the CPS.
Does the tach needle move at all when cranking? If yes and it isn't erratic that is a sign that the CPS is working. It's not an absolute test but it's a good sign.
Good luck!!!
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"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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