Master Cylinder pressure switch...dual pole or single?

[Kemo]

After digging around, i feel that i have a car that should have a dual pole pressure switch on the master cylinder.

the reason i think this is so is based on the fact that i have 2 brown wires with only one of them hooked up. my thoughts are that a single pole switch was installed and one of the wires was taped up with electrical tape and stuffed up in there.

At this point, i am curious what this switch does... it seems that it is some form of "connect the ground" as they both seem to be ground wires hanging down there and the actual ground would come from the master cylinder itself?

in any event, am I on the right track here that i need a dual pole for my car?

link to part here on PP: https://www.pelicanparts.com/More_Info/90161311501.htm?pn=901-613-115-01-OEM&bc=c&SVSVSI=4251

[Kemo]

and here is a snapshot of the MC and wires:

[djpateman]

Originally they all had 2 pole switches, but they began to be replaced by the single pole version a long time ago. AFAIK the 2 pole switches are not self grounding, thus requiring the ground pole. The one wire is brown with a yellow stripe and should be connected to the single pole switch. The single pole switch has the benefit of a reset button. I was replacing failing master cylinders after just 7 years of use back in the day, so switches were quickly replaced as they usually came with the M/C.

[Dave at Pelican Parts]

Correct, Dave. The two-pole sender shorts the brown/white wire to the brown wire, which is a ground. The one-pole sender shorts the brown/white wire to its threads, which should be a ground. When this one is used, the brown wire gets taped up out of the way somewhere.

--DD

[Kemo]

Thanks for all the great information! This is my first go-round working with a 914. hoping to get the car back on the road by spring! 2 pole switch on the way