Switch

Neutral Safety

NS-01
Ford: D8TZ-7A247A, D8TZ-7A247B
Wells: F403
Standard: NS55

NS-08
GM: 1994201, 1994202, 1994221, 1994226, 1994229
Wells: DR423
Standard: NS21

NS-12
GM: 11516116, 14086978, 1994247, 1994255
Wells: DR441
Standard: NS37

NS-06
GM: 1994256
Wells: DR420
Standard: NS30

Oil Pressure

OP-30
1/8" 27 Dryseal Thread. Term. "A" to ground, NC, opens at 3-9 psi. Term. "B"-"C", NO, closes at 11 psi. Also used simultaneously as an Electric Choke Heater switch.
AMC: 3231347
Chrysler: 37474321, 4186352
GM: 14057554
Wells: PS-122
Standard: PS-133

OP-04
1/4" -18 Dryseal Thread. 2-7psi, normally open. Also used simultaneously as an Electric Choke Heater or Electric Fuel Pump Switch.
GM: 1260636, 1639853, 25025318, 25036555, 25500672, 25502419
Wells: PS-113
Standard: PS-129X

OP-42
1/4" -18 Dryseal Thread. 3-9 psi, normally closed.
Ford: C7AZ-9278, C7AZ-9278B
Wells: PS-38
Standard: PS-18

OP-55
V6-196, 231 Eng. 1/4" 18 Dryseal Thread. Term. "P" - "S" NC, opens at 1-5 psi. Term. "P" - "I" NO, closes at 5-10 psi. Also used simultaneously as an Electric Choke Heater switch.
GM: 1249945, 25500673, 25504803
Wells: PS-108
Standard: PS-148