Not so fast. Altimeter requires barometer valve and temperature. So you are going to input these values or detect them.How about a combined ALT/VSI/ASI sized to fit in a standard 3 1/8 in instrument hole using just LEDs?
Yeah, but why write the entire UI yourself? Plus a commercial tablet already has a touch-screen, and the API to access it. Why reinvent the wheel?Adding a display would not cost much more. A 7" TFT display with driver board is around $30.