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I tried using a pulley puller with moderate force to remove the tachometer but it didn’t seem so budge (although I didn’t use heat to soften potential adhesive inside).

Looking at the shaft I can see two slots similar to what I have seen in threaded optical tubes with filters in them. Is there an analogous tool used to thread or unthread tachometers onto shafts? I don’t want to be trying to pull something off that is threaded on. Hopefully this looks familiar to someone and they can advise.

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UPDATE: I have tried pulling harder using a pulley puller and a cast aluminum disc that I specially machined for this. The disc buckled and broke leading me to believe the tach rotor is attached pretty tightly and possibly is indeed threaded onto the shaft.

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user391339
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I saw those notches and thought of this wrench I used years ago to remove the sprocket from a bicycle wheel. Bicycle Sprocket Wrench
I'm not sure something of that design would work in this case because you don't have enough the plane where the ears would fit into those notches to allow turning it. One idea is to make a tool like this by grinding down (as per @SolarMike) an old socket and bolt the result into the tachometer to keep it in place while unscrewing. I don't think you will be successful removing this thing unless you turn both notches at the same time.

user1683793
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