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Installed a new Sun tach in a 68. Has a stock HEI distributor. Connected green wire to tach terminal on dist. cap,(per instructions) red wire to 12 volts, and am sure ground is good. I get the slight needle movement when turning the ignition switch on, but no rpm reading. I pulled the coil cover off to make sure the terminal was not damaged, it's ok. Any ideas??
 

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Might want to put a meter on 12V and make sure it's there when key is in on position.
 
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