there should be a plug for your tach coming out of the distributor. If not, there should be a "+" and a "-" on the distributor. Typically there is 4 wires coming a tach (auto meter for example) take one to ignition hot, one to 12v(if you have a backlight), one to ground on battery, and one to the "-" of the distributor... that will get your tach working..
Do do some searches on this. There was a sticky on how to make a filter for this. Before I added a tach in my non tach 69. I had read that adding a HEI to an original factory tach would fry them. But the new tachs were not a problem anymore. I have a MSD HEI and repop tach, no filter and no problem. Maybe you can find the post or sticky that told how to make the filter and see if that helps. But your tach may be toast also if everything is hooked up correctly.
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