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Doing this work in a clean place like your kitchen is the right way. To most car fixers, "blow it out" means to pick up the air hose from the garage floor, disconnect the pneumatic wrench and snap on a nozzle. Using a computer duster or equivalent in a clean environment would not be likely to damage anything in the speedometer.
Even though the canned gas doesn't cause damage, I still would not recommend it for removing the broken gear teeth because it relies on the assumption the wind it creates will find and remove every one. Better to know for certain, and find the broken gear teeth the old fashioned way.
Without any odometer problems, there's really only one way* the speedometer needle would limit at 40 or any other number, and that is a mechanical obstruction to the needle's movement. The speedometer is entirely electronic up to the meter movement, so the gears in the odo have nothing to do with it.
Reading "I read somewhere that the replacement odometer gears from ipd are too thick..." I'm guessing you found this recent post and the new information about the odometer not working correctly might change things for the speedometer too. It could now be blamed on an electrical circuit, such as a broken solder or other poor connection.
I posted a schematic of the 92/93 gauge in that thread which might be of help to someone with electronics experience, but I can't guess how to identify the problem by visual inspection. The 92/93 gauge is especially delicate where it adds the divide-by-4 prescalar circuit on a tiny add-on surface mount card to process the signal from the ABS-compatible rear axle sending unit.
Of course, knowing this symptom first appeared after working on it, I'd think the best approach would be to carefully go over your work, and consider the odometer trouble could be related to the speedometer sticking at 40, or it may be entirely unrelated.
*This should not be confused with a completely different technology used in the 740/940 Yazaki speedometer, which will indeed stick at 40 when one of its quadrature coils is not driven.
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Art Benstein near Baltimore
England has no kidney bank, but it does have a Liverpool.
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