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are you talking about a sm. block hei. dist. if so there are 2 spade connectors on the side of the cap , one says tach.
The tach signal comes from the negative side of the coil.
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How do you install a Sunpro super tach 2 tachometer in a 1994 Silverado?
hook your green wire from the tach to the white wire from the coil PAC it should be a white and a yellow wire coming from the coil. the tach should have a white wire that will be your light inside the tach a red wire for power and a black for ground.. good luck
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You would hook to the negative side of the coil. Some HEI distributor caps are marked "tach".
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You will have to find the coil first.
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Hook it to the negative side of the coil.
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If your car has a distributor it is the negative on the coil.
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The green wire from the tach goes to the negative side of the coil.
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Check the wire connections on the coil. If ok, the tach may be bad.
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negative side of the coil
