Sorry, I didnt mean I checked my temp with my finger to set the needle. That is just an observation I make after setting the engine via climbouts. Same as I used to do with temp gauges. I just went from digital to single digit and the information is about as useful. At one time I would set the engine via climbouts and then looked at the temp gauge. After awhile, I stopped looking at the gauge then I gave them away (I kept the raytech to shoot beverage containers and my hand while waiting for a heli to charge on a slow day). It didn't tell me anything. It doesnt matter to me what the external temp of the engine is. I want the best fuel/air mixture. Lean does not equal more power. Too lean throws you back off the curve even before it could overheat. You can be rich or lean or just right. I had both a venom and a raytech but neither told me anything that power climbouts didn't and they never told me 'just right'. People complain about bearings falling out, midrange, and all that (and you know some of these guys are using temp gauges) but I don't know how many cases I have in mine and it is still ticking good as new. I have a new one in another heli and they perform equally. And having an engine running at the right fuel/air mixture makes you a lot more confident performing 3D. It is just my opinion but based on my experience, the gauge is a crutch or charm that you will eventually keep in your junk drawer. The performance is what sets your needle anyway so why bother with anything else? Test the performance. If you drilled into the head and put a sensor reading the combustion chamber then you might have something.