Don't really know how to test one out of the car. You could always pick up a Wells VR715. It's a solid sate vr that is a direct replacement for the old mechanical ones. Should be less than $20. Autozone also sells one under the Duralast brand which is made by Wells.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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