Oil Pressure Switch Wires

[RetroTexan]

1989 K100LT

I have 2 wires coming from the Hall Sensor Cover that disappear into the engine towards the oil pressure switch.

One is a black OEM wire (the tag is ripped so I can’t see the oem label) and the other is a green/brown that I understand goes to the oil pressure sensor.

Does anyone know what the black wire is supposed to be?

[frankenduck]

Sensor for the temp gauge.

[RetroTexan]

Mmm I'm not sure that's it. Unless I’m mistaken, the wires for the Temp Sensor are Green/Violet and the sensor itself is attached to the engine in a different location just below the fan (pic attached)

[Laitch]

Mmm I'm not sure that's it. Unless I’m mistaken, the wires for the Temp Sensor are Green/Violet and the sensor itself is attached to the engine in a different location just below the fan (pic attached)

The temperature gauge is the topic of frankenduck's post. If you've got a gauge, there's a temperature sensor screwed into the water pump to which the gauge is attached by the wire illustrated here.

[RetroTexan]

Disregard my last comment, y'all are both correct. Looks like it is for a second sensor for a Temp "Gauge" which is connected to Additional Instruments. My wiring diagram doesn't show it which had been confusing me.

https://www.k100-forum.com/t10611-sensor-electric-contact-cleaning-maintenance

Thanks for the reply!

[frankenduck]

Here's the wiring diagram for the fuel and temp gauges:

http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/kwiring/K100/K75.K100.Additional.Instruments(Fuel&Temp).SLP.V1.0.pdf