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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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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