| Speed
                    Sensor (ST670)
                     Simply plug this
                    speed sensor into the wiring loom to enable speed to be
                    displayed on the LCD readout.  This option is not
                    available on the Standard ST8100 unit 
                    Straight
                    and Corner\ Speed 
                    Readout (ST8109)  | 
                  
                     Lap Timing
                    System (ST546) 
                    The
                    lap timing receiver simply plugs into the standard dash
                    wiring harness.  When the vehicle passes the track side
                    beacon the lap times "pop up" on the LCD display,
                    accurate to 1/100th of a second.  |