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you have a short to ground in your wire harness, you should have a big cap style HEI distributor. theres 3 clips that plug into the cap, a single wire that goes from the cap to the main harness is the tach wire. make sure its plugged in and not exposed anywhere near the block
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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