Have a 1998 15HP Merc. Have NO SPARK BOTH PLUG WIRES.<br />RAN OK A WEEK AGO AND I HOOKED UP A TELEFLEX TACH TO FACTORY WIRING FOR A TACH.NEVER RAN THE MOTOR WITH IT HOOKED UP. ANY IDEAS? I DID TURN THE IGNITION KEY ON...and THE TACH DID "0", I THEN UNPLUGGED AND ATTEMPTED TO TEST RUN BEFORE A TRIP. DEAD PLUGS!!<br />HELP!!!! STARTING POINT? THANKS, BILL