I've got an install diagram for that around here somewhere but for now, the trigger wire to run the tach itself goes to the "tach" connection next to the "Bat" terminal on the distributor cap. one wire attaches to your dash lighting so it comes on with the dash lights and dims properly, the other wire is likely a ground. If I don't add to this later, try googling Sun electronics...I am fairly sure they have an install page.
Need install diagram
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How do i hook up a sunpro super tach lll in a 1993 blazer
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