98 Honda BF40 Wiring and Warning Lights

Ok, while waiting for my carb kits to arrive, I thought I'd dig into some other bugaboos that have been irking me since I've owned this boat. The warning indicator lights have never worked.

I got to searching and found this thread and followed it. Unfortunately, it wasn't a success for me. I have continuity on the thermal (red) wire from the terminal on the engine to the controls but I do NOT have continuity on the yellow wire on the oil pressure sensor switch. I removed the wire from the sensor and have continuity from the terminal to the side of the switch body (as suggested in the service manual) so I don't believe it's the switch.

The motor runs great (aside from the carb issue) and the lights have never worked in my ownership. I'm wondering if I have a problem with voltage getting to where it's supposed to be. I seem to have a disappearing ground that comes and goes and I can't figure out why for the life of me. Is there a way to bench test the lights with standard 12V directly hooked up to a battery? That will at least eliminate the lights as the culprit.

Should I have continuity from the OPS' yellow wire to the control yellow wire or is that only when triggered somehow in the CDI?
Thanks!
Scott

If your senor works the yellow becomes the negative and the light should light up.

Ok thanks, but is there a way to test either the sensor or the lamp itself? Do you know if I should have continuity from the sensor wire to the controls? I don't currently. I think tomorrow I might try running a temp wire from the sensor to the lamp and see if that does the trick.

The manual says this: until the switch is actuated physically by oil pressure, which opens the switch inside the sensor breaking the contacts continuity the light should go out for 1 wire switches or connecting both pins on 2wire switches .connect black & yellow to + and yellow to negative to test the light .

Ok so I hooked up 12v+ to black and yellow and 12V- to the yellow directly from a house battery and no joy. Looks like i'll be buying a new part. I appreciate the help!