dual gas tank switch problem

[BrookelynnGreen]

I just got a new 86 chevy, I have dual gas tanks and I messed with the switch. The current right hand gas tank is the one the guy said he has been using, today I pressed the switch to flip to the left hand gas tank, and the gauge shot all the way to the left like it was overfull, and my truck died because there was no gas. I tried to flip the switch back to the left and it took it about a few clicks to switch. Maybe I dunno how to use the switch??? Do I hold it to the tank I want, or should I just press it once and it should switch over?
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