OK, rotary switches are not spec'd the way most other switches are. You'll never see a "DPDT" rotary switch because there's no such animal. The are spec'd by the number of poles and positions. You then wire them up to get the particular behavior you need. To make a double-pole double-throw switch, you need a rotary switch with at least four poles and at least two positions. (A one-position switch would be quite odd, wouldn't it?)
I think your biggest challenge will be to find a rotary switch rated at 30 amps DC. You'll have an easier time finding a solution if you add a relay to the circuit. If you use a DPDT relay, then you can run the gauge through one pole and the valve through the other. Now all you need is a SPST switch. If you really must have a rotary switch, it will be cheaper and easier to find one rated at a few hundred milliamps than one rated at 30 amps DC. It will also be much smaller, so you stand a chance of fitting it into your dash.
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