Last year I installed aTrail Tech speedo/engcoolant temp/tach on my 01 DS650 and ever since the Automter Tach does not work. it still lights up and also resets itself when ignition is turned on it goes to 5k then back to zeroand is light up but once started no movement it just sets at zero but the tach on the traltech works fine. I want to sell my DS but want everything working on it before I try to sell it. Any info would be great. I do have a signal at the tach connection so I hope their is nothing wrong with the Tach itself. I did disconnect the battery when I installed the Trail Tech so nothing would get fried also.