I am not getting my autometer tach to run. I installed an MSD 6AL brand new. Instructions and MSD call verified I should use the gray wire coming from the msd box. They also told me the autometer tach I bought brand new needs no extra parts to make it work. Basically I have a keyed on ignition wire which checked live plugged to the positive terminal. I have the gray wire plugged on the signal terminal. I have a ground in and a graound out to the next guage and I have a dash light feed in and one out to the next guage. I think this is correct but my tach just sits there. I do have other autometer gauges such as voltage, water temp, oil pressure which all seem to work fine. And they are all jumped for ground and lights along with each power feed from the sending units. Anybody want to venture where I should look? How can I test that signal wire for the signal? Tach is on the left. White wires are grounds. Orange is lighting feed. The two empty tach terminals were wired with the gray signal from msd on top and my keyed power source on the bottom?? Isn't that correct??