ok well this is factory,, both of these parts.
most motors '80s up motors were this way, by the time that the electric choke years models came out. the E4ME carb models for example.
however one is actually a sensor for dash and the other is a switch, for choke or for fuel pump depending on if is a tbi motor truck or carb motor truck, etc.
one is for fuel pump or for the electric choke models. and other is for dash.. like Rick has stated. he knows..
why ppl have to post incorrect info is beyond me,.
just because someone has never seen something does not mean thats how all of them were..
ppl should not just blindly assume things. and that all motors and models ran the exact same oil switch and sensor systems.. when that is totally not the case..
here is a pic of many random different OP switches that i have stashed around here, the ones with black plastiic plug wire terminals kind of oval-shaped end with the three terminals/pins are from stock oil pressure switches 1987-up GM TBI or other '80s and up GM fuel injected motors. for the fuel pump, typically.
and the one with the red writing on it is not from a V8 it is from a MPFI V-6 or possibly a 2.5L or 2.2L GM as late as early 2000s years. like an N or J body car,
or possibly an S-series truck,
and then there is another one of these sensors right below this one, next to the two-spade OP sensor or switch.
there is also a heated O2 sensor and also an air temp sensor in the pic too lol.
and heated means that it is not a single-wire sensor, and that it has two wires for the heating circuit "coil" that is built into the sensor, to heat it. for when its cold. etc.
so that it will begin to talk to the PCM, and send or communicate voltages/values much quicker, for when its cold, etc.,
because a non-heated single-terminall O2 sensor is essentially "asleep" until it hits a certain temp,
and the short length three-spade sensor or switch may possibly be a transmission temp sensor.
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