I used UMA 2 1/4 inch non-TSO flight instruments. UMA didn't have the exact Airspeed Indicator speed range I wanted shown in the catalog so I called them. They said they would make whatever I wanted at no extra cost. I ordered through Aircraft Spruce. I'm happy with the smaller instruments but I understand not everyone would be. You can get 2 1/4 inch instruments a little cheaper from Falcon but they are made in China. I spent a couple extra bucks on the USA company and was rewarded with good customer service. If you are comfortable with digital instruments you might check out Belite. They have a whole line of flight instruments as well as engine and fuel monitoring equipment. I agree with DaleB on minimal equipment. As slow as your plane flies you could even forgo the Slip Indicator Ball and use with a Yaw String.

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