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Hi and thank you for your question.
It is quite curious that both wave runners have the same problem, no speedo display. You said they go through the check, which is encouraging, but do the other functions actually work after it goes through the check? Things such as the tachometer, fuel level gauge, hour meter, etc?
If the paddle wheels are spinning freely and you are still not getting any display while riding the skis, I would suggest looking for the triangular white plastic connector and see if it is unplugged or possibly corroded.
Let me know what you find with this and we can go from here if need be.
Typically it is found on the left side of the craft just ahead of the engine compartment. You should see the main harness of wires there and it should be in that bunch. Alternatively, you can start at the leads coming out of the meter and trace them backwards to the white triangular connector. It should not be terribly difficult to find. You can try pulling the seat off and looking from inside the engine compartment forward or open the front hatch and pull the storage locker out and look back towards the engine.
Powering up the hall effect sensors and testing the output.
Its a test for the speed sensor. I am still waiting for you to answer the other questions before we get into that. It is important that we proceed in a methodical order. Please refer to my first response and address those questions and inspections and let me know what you find. Truly, the hall effect failing is very low probability so I suspect it is something else.
Not a problem. I completely understand. I am going with the highest probability of failure first. Hall effect sensors just don't ever fail. Well, almost never. :)