This what I have on the bench. Not a very good video but it will give you and idea. I have both tach and speed on the same source.
I'd like to hear from some people that have succeeded in producing a tachometer or speedometer with the FB. My searches have yielded attempts and I hope they just never bothered to post their sucesses. Looking for some confidence I'm not wasting my time on these two points.
Your engine sounds like a conure.
Really the engine is a couple of cockatiels..
power input made some improvements last night, getting close with the Tach. Engine cooling fans on are still throwing it off 0.15V. Speed still a mess...
Okay, I've never used a fusion brain to do this but in 1986 I got speed from my car by using an infrared LED emitter and detector to bounce light off of the speedo housing (which was U shaped) as it turned. A friend built a digital circuit to count the number of times the housing went by and we queried the circuit to get the number and made the speed calculation based on the time that went by.
Surely the FB can count the number of times something turns -perhaps from a Hall effect sensor and then do the math?
I'll only partially hijack this thread with the actual circuit as this is mildly relevant. The diagram shows at the bottom the LED emitter and detector. The rest of the circuit is the actual counting stuff.
Don't they have magnetic sensors you could put on an axle that could feed counts into the FB?