Well, crap, I thought I had one out in the garage but I can't find it. From my not-so-good memory, I think you stick a needle or pin into the green wire (sounds wierd but I don't even remember what color wires are there) and connect the multimeter to that. Look on the Corral in their tech articles. I think they have a how to on setting it and which wires to use. It's easy for me, I've got the Moates Quarter Horse for tuning and I just start a log s e s s i o n and look at my laptop and see what the reading is. Then I just move it around till I get about .98 volts and lock it down.