FraggyTDI
Veteran Member
This is what i assumed as well. That if unplugged it would trigger a light. However Mone does the opposite. As far as the ground goes I assume it does it through the sensor it's self. However at this point I'll just set an alarm on my gauge.I don't know the specific logic - most of them are a sourced input that gets pulled to ground when the switch is closed (pressure is above spec).
That way if the wire comes off/breaks it tells you that you have low oil when you might not rather than the other way around.
Since there is only one wire to the switch it's grounded at some point, I just don't know when.