1998 Chevy S-10 Trouble Starting/ Guages

My S-10 has had trouble starting over the last few months. Its can crank continously on the first attempt and never starts; but if you stop then make a second attempt it usually fires up every time. What could be causing this?

Also, the guages and the radio will shut off spiratically while you are driving. At first I thought it was the altenator, but its been doing this for months and still continues to run. I already replaced the battery and the terminals are down tight. It tends to happen more frequently when I hit bumps- so my guess is a loose wire.
Any help would be greatly appreciated