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My experience with the microswitches is that they can sometimes get out of adjustment and if that happens, even slightly, the cowl flap motors will continue to run and burn out. As we all know they are expensive to replace.
My 77 337G has this set up, but I never depend on the microswitches to turn off the cowl flap motors. As soon as I get the indicator lights that the cowl flaps are open or closed, I return the selector switch to the middle (off) position. Using this method I haven't (knock on wood) had a cowl flap motor issue in 20 years.
Just my 2 cents.
Kevin
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