Have you tried any of the methods to see what works?

I have trouble getting my 1991 240 to reset.
There is a stiff wire that comes off a push-in type button. It mechanically pushes a lever up to move gears or something. It is all on the back of the speedometer that makes it cumbersome.
I had to put in a small filler spacer to get enough push up as it lacked about an 3mm movement.
That did work several times, I think?
Then again, sometimes, I have to do it over and over.
I have come to a conclusion that it’s either a mechanical thing or might even have to do with the ignition switch being on enough at a precise length of time while I push the button or the ECU it gives up. Got me?
In other words I’m not sure what makes mine work either.
It just seems to quit bothering me until the mileage goes along far enough to start the whole sequence all over again at 3-5,000 or 7,500 miles.
It takes awhile for me to put on that kind of mileage with the fleet choices I have.
I must admit, I might be a horde of vehicles with over approximately 60 years of driving collected.

I can see why you are keeping your ‘06 running.

Phil