Installed new coil, now the tach acts funny

Okay, so Autometer is saying I need to connect the tach wire to the signal wire of the distributor. I think I incorrectly assumed the signal wire would be negative, since usually the tach wire is connected to the negative terminal on the coil. I'm not quite understanding what you mean by "bare" terminal. Do you mean the male end on the harness end of the connection?

I'm glad you mentioned the radio suppression capacitor, because several weeks ago, I thought for some reason I had it wired backwards and swapped terminals. It was on the +, I swapped it to the - terminal. Car ran great, tach worked fine with no changes, I thought everything was hunky dory. And I'm wondering if I even need it at all?