Oil Pressure Switch with tapered thread. As fitted to Triumph T120/TR6 Twins, T90/T100 Daytona, Adventurer models (1969-73). Also some BSA A65 models.
Thread: Tapered thread 27 TPI
OEM: PS5320/6, 60-2133
WARNING: 60-2133 has a tapered thread and fitted to early timing covers. If over tightened it will split the cover. For the parallel thread Oil Pressure switch use 60-3719