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I haven't tried this specifically yet. The next cold day start will be the best time to test it as that's the only time there's an issue. Never happens above 40F.

I tried this today. Needle is off zero to begin with, then goes to zero on ignition switch on. No change if I cycle mode once the truck is running. However, this speedometer does act squirrelly at times when driving. It's gone to zero a few times while on the street and I have to stop and...

That's Helpful feedback. Glad it's not a rabbit hole. Once I setup the cc stuff it'll be an unused button anyway.

It's definitely going into fast idle mode but the rpm change Varies greatly. Normally to about 1200 rpm but half the time it only goes up by 50-100. unless... there's 2 setpoints? this threads info is showing that there's 2...

What's weird is that it only bumps up a small amount of rpm's, barely noticeable but clearly as a result of the switch activation.

I've notice a continuing issue when cold, this fast idle switch does not always trigger a fast idle. Half the time the engine bumps up a very small amount of rpm's instead of the usual 1200ish Goes away if I restart after warming up.