Turn everything off and see if there is a spark at the bat cable when you conect and disconect the cables. If so disconect the light to the tach and retry The spark will stop when you find the culprit.
I have never been a fan of interstate batteries, when I was buing used cars and salvage that was the only bat that you could count on to be a dud.
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69 Chevy short fleet side soon to have LT1 and 4L60E pb. ps cruise and air.
68 Chevy short fleet side 400 sb 5 inch chop top pb. ps. pw. 350 auto and shaved handles
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68 Chevy fleet side long wheel base complete parts truck.
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