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T120/TR6, the unit 650cc two cylinders

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OIL PRESSURE SWITCH 26TPI
60-2133
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Fits BSA A50/65 and early Triumphs.
Tapered, conical thread 27TPI.
The later machines use 27TPI,  STRAIGHT THREAD order 60-3719

GEARBOX SPROCKET 650 TWINS
SPR4SP18T
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Gearbox sprocket for all unit 650 twins 1963-73
Triumph part numbers
18t  57-1917
19t  57-1918