KZ1000J oil pressure sending unti

Can someone explain how the above sending unit actually works. I know on most KZ engines the sending unit is made of metal and is grounded when it is screwed into the engine. The one wire on the sending unit is the ground for the oil light which is always hot. When the oil pressure builds the circuit is broken, this breaks the ground which turns out the light.
Now on the KZ1000J models the sending unit is plastic and there is only one wire coming from the sending unit. Since the housing is plastic it cannot ground to the engine, how is this circuit different from the others?

Kzs use a plastic switch also on 900/1000 anyway

That's the one I am referring to.

baldy110 wrote: Can someone explain how the above sending unit actually works. I know on most KZ engines the sending unit is made of metal and is grounded when it is screwed into the engine. The one wire on the sending unit is the ground for the oil light which is always hot. When the oil pressure builds the circuit is broken, this breaks the ground which turns out the light.
Now on the KZ1000J models the sending unit is plastic and there is only one wire coming from the sending unit. Since the housing is plastic it cannot ground to the engine, how is this circuit different from the others?

There is always connectivity between the plunger and the tip where the blue wire attaches, regardless of the plunger position (extended or compressed).

My best guess is that the extended plunger grounds against the engine case to provide a ground for the indicator bulb, being when the engine isn't running, or there's insufficient oil pressure.

And that oil pressure pushing the plunger upward interrupts the plunger's ground against the engine case, whereby the indicator bulb loses its ground.

Good Fortune!

Thanks Patton that makes sense.