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Discussion Starter #1
Twice now, I've started the bike cold in ~45F weather, and I've seen the oil light on when it starts up. I shut the engine off and restart, and the light goes off as usual.

The oil level is fine, and the level drops (as expected) when running. The light has never come on while riding or idling, hot or cold. Only immediately after a cold start. Beyond the light itself, I've never had any indication that there's a problem with the oil. Has anyone ever experienced this? I'm suspecting the pressure sensor itself.

I don't know if it's related but, I've also had some intermittent electrical issues in the ignition. Sometimes I have to jiggle the key to get everything to turn on, but it's never shut off on me while running. Today, after stopping for gas, I somehow got it to start and run with the Tach reading 0. My idle is ~1000. I turned the key off and back on, and restarted and the Tach functioned normally. This may or may not be related to the oil light issue.

I'll probably need a new ignition soon.:doh:
 

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I’m not a mechanic, I’ve read plenty of folks on here with a hell of a lot more experience than I but my first guess would be to check the electrical connections for those circuits. Corrosion can short or open circuit. Also temp can play into any electro-mechanical issues due to expansion and contraction etc. Just a thought
 

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I take oil lights seriously. check the connection at the pressure sensor. Remove the sensor and take a look at it. I have seen oil pressure sending units fail or partially fail from sludge buildup.
 

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It's likely a bad pressure sensor.

For what it's worth, the ignition switch can't drop the tachometer without also dropping the starter circuit.
If your bike is already running and the tach drops to zero, you're in a scenario where your 'voltage monitor' wire going into a non-mosfet R/R may be zero, and your R/R may burn up trying to bump the volts higher, or may pass a much-higher-than-wanted voltage to the rest of your electrical system.
 

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Discussion Starter #5
I have an aftermarket R/R without a monitor wire connection. It only has three stator connections, battery and ground. The tach thing was really weird!

I'll keep an eye on the oil light. I have an external oil pressure gauge. Does anyone know what the pressure is supposed to be? I may be able to connect the gauge and verify the actual pressure.

I had a pressure switch fail once on a Mercury Sable with 220,000 miles. It was enough miles that it could have legitimately had no oil pressure, but the external guage showed right at factory spec. My old F150 on the otherhand, showed actual low pressure and it got a new V8 a couple of years ago. I'm hoping for the Sable situation and not the F150 situation.
 

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At 1,000 RPM, the oil pressure should be 2 to 4 lbs. At 2,000 RPM the oil pressure should be 30 to 38 lbs.
 
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