How do I hook up my tach to the Dyna 2000? Matt May 22, 2018 23:54 Follow In dual fire installations, you may use the factory tach connection or you can use the tach output provided with the Dyna 2000-HD1E. For single fire applications, you must use the Dyna 2000 tach output green wire for correct single fire operation. Related articles My motor stalled and the red LED was flashing continuously. What is wrong? Will my stock pickup work in single fire mode with the Dyna 2000? How? Comments 0 comments Please sign in to leave a comment.