I'm thinking of replacing my original airspeed ind in my 150/150G. My daughter will be going for all the ratings and I'd rather her think in knots only, rather than mph.
The parts suppliers all sell the same stuff. You should check prices with 2 or 3 of them then make your decision. I'd look at Chief Aircraft, Aircraft Spruce, Pacific Coast Avionics, etc.
Dan
Civilization is the limitless multiplication of unnecessary necessities. (Mark Twain)