Hydraulic activated brake light switch on some M35A1 and M35A2 trucks, M37. See p/n 11602160 if your M35 truck has the air operated stop light switch. Also used as the backup light switch (located on transmission) for M35A3.
NSN 5930002920520. p/n 5972752, 1733-1500, S17331500, 5972752-B, 7388813.
1/8 inch pipe threads.
For mating electrical connector see p/n MS27145-1.
This switch can be added to the M939 series (Allison MT654CR transmission) if backup lights or a backup alarm is needed. The port which provides pressure to the switch in reverse gear is located on the passenger side behind the PTO opening.