Someone made an analog one a few years ago but it was ANT+ I think or BTLE or whatever

>>2078009
The only way you can have RPM and speed measured by the same dial is if the model is locked to a specific wheel diameter. Different wheel diameters have different relationships between RPM and speed, and you need completely different gauge markings.
If it didn't claim to display RPM on the gauge, I might not have noticed, but it's 100% non-adjustable/tunable.
>5,000 m / hr divided by (400 RPM times 60 minutes in an hour) = 2083 mm per revolution
>2083 mm per revolution = 66.3 cm wheel diameter or about 26 and 1/8th inches
Hope that exactly matches your bicycle and you don't care about things like tire wear or inflation pressure.

>>2078014
i don't care about rpm if it's the wheel's rpm. now if it can somehow measure the pedals's rpm (cadence) that's a different story, it would be like the rpm gauge in a car.

>>2078015
im like 90% sure these are just third shift/b-grade qa fail units off of motorcycles

they probably work fine but after looking into them myself a few weeks ago it's a lot of cabling and weirdness that's probably not worth the SOVL of a mechanical gauge

if you dont want a battery operated thing you could try to figure out a stator/rotor setup to do it without needing a battery like engines use for their timing and tach but that might lose you enough energy to magnets that you can feel it

>>2078014
good models have a tuning screw and you can probably just replace the faceplate with the actual numbers on it. it should always measure RPM accurately (that is what it is actually measuring, with a little spring loaded clutch thingy right at the axle) but you can figure out that function for RPM to actual wheel speed and sharpie in new numbers on a piece of paper you stick to it

>tire wear
you're losing max like 2.99mm before your tire is unserviceable junk
>inflation
just keep your tires inflated??

>>2078015
you could probably bodge a collar and belt system to drive it off the pedals right at the crank