To help you get the ball rolling, here is a library of pre-configured gauges.  The object properties are listed with each shape so that if you see something you like, you can enter the same properties for the shape on your dashboard.  To view a gauge, click on its Properties link under its description below.

Remember, you can borrow a needle from this gauge, an ellipse from that gauge, tick marks from another, etc and throw different shapes from each of these gauges onto one of your own.  But when you do this, remember to set the center point for the objects accordingly so that the objects on the gauge line up the way you like.   The easiest way to keep the gauge together is to put all elements of the gauge in one container.  This way, you can move and scale the entire gauge as a whole instead of having to change each object individually.