OEM Harley Davidson Turn Signal Module TSM Dyna Touring Softail FLHR 68920-01BOEM Harley Davidson Turn Signal Module TSM Dyna Touring Softail FLHR 68920 01B Part #: 68920 01B Harley Davidson part number 68920 01B is a genuine OEM Turn Signal Security Module (TSSM). It functions as a turn signal blinker canceller and may also incorporate security features, depending on the specific model and year of the motorcycle it was originally installed on. Part Name: Turn Signal Security Module (TSSM) or Turn Signal Module (TSM). Function: