I just installed my new 140 amp alternator from http://www.roverconnection.com/ in my 91 RR and I am having trouble with the two wire pigtail. Has anyone had experience with this? One wire from the pigtail is connected to the ring connector from the harness and the other, I assume, is connected to my tach wire. Now I have no tach and the battery light is still on. I also installed a new red top optima battery. What did I do wrong?