Equus 3042 analyzer question

OK, I'm a 50% idiot. The destructions do refer to one pic of the +- leads (All test) clipped to the battery while reading tach function (obvious to me now) but the part that wasn't my fault was the inductive lead coaxial cable was broken under some tape that I found. I spliced them together and the tach started to function, and hovered just under 8 at idle, spec is 750. Now I just have to get a working vacuum gauge (mine broke somehow) and Ill be set. The batteries are only for the resistance (ohm) readings. I turned the idle mixture screw out 1 turn and the RPM's raised just a tad. Ill work on that later.