To add to what sk66 said:
With the important distinction that the aircraft attitude indicator is a gyroscope based device and therefore independent of inertial effects. The inclinometer is not. For instance, it will indicate that the vehicle is tilted if you're cornering hard on flat ground because it's basically a pendulum. You'd get the same indication if you had a weight hanging on a string from the rear view mirror with a left-right/fore-aft crosshair painted on the dash.
The altimeter doesn't sense altitude directly. There's no way for a simple mechanical device to know where it is relative to a human defined rough average of world wide sea level. It's a cleverly disguised pressure gauge that takes advantage of the fact that the higher up you are the less atmosphere there is above you constantly being pulled down by gravity. In other words, atmospheric pressure decreases as you increase in elevation. The problem is that the Earth's surface isn't uniformly heated by the sun and it's spinning at a great rate of speed. As a result the atmosphere isn't uniform in density and is constantly flowing from one place to another in order to rebalance itself. That's weather. In an aircraft, every radio tower at every airport is reading out the local atmospheric pressure which you dial up in a little window in the corner of the altimeter using a knob to correct the altitude reading. Pretty crude actually. Leaves a lot of room for error which is why aircraft don't fly close to terrain in the blind. The Delica version doesn't have the barometric pressure reading window so you work the problem backwards by setting it for the correct reading when at a known surveyed altitude. The problem is that the next day, at the same spot, the reading won't be the same because the atmospheric pressure has likely changed. If you're taking a trip up the mountain and you set it in the morning it should still be fairly accurate when you get to the top by lunch time. Both gauges, despite the cool factor, are gimmicky representations of true instruments that are pretty crude themselves.
Sorry, as a certificated aircraft maintenance technician (aircraft mechanic in common parlance) I couldn't resist.
