Hey, I'm setting up a stereo rig with a Peavey VK 212 combo and a 5150 412 cabinet. I'm trying to figure out how to set the ohm switch and also what kind of cable (gauge) to use? I haven't done anything yet because I have messed up tube amps in the past by screwing up the speaker load (recording out of a head through the preamp out with no speaker connected). So just trying to be cautious. Any advice would be a huge help, thanks.
What are the ohms on the speakers in the valveking and what is the ohm rating on the cabinet? It should be labeled on the back.
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^ that.
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I'm trying to figure out how to set the ohm switch and also what kind of cable (gauge) to use?
22 or 24 AWG unshielded cable.
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^ that.
22 or 24 AWG unshielded cable.

Absolutely not. That gauge is fine inside the guitar, not for speaker cable.

I'd suggest 18 or 16 gauge (you'll find that's about where most speaker cable lives for lengths under about 20 feet).
Most 4x12s run mono at around 8 ohms.
If your 2x12 internal runs 8 ohms, you should plan on the overall impedance being about 4 ohms.

Maximum wire lengths for two conductor copper wire[4]

Wire size 2 Ω load 4 Ω load 6 Ω load 8 Ω load

22 AWG (0.326 mm2) 3 ft (0.9 m) 6 ft (1.8 m) 9 ft (2.7 m) 12 ft (3.6 m)
20 AWG (0.518 mm2) 5 ft (1.5 m) 10 ft (3 m) 15 ft (4.5 m) 20 ft (6 m)
18 AWG (0.823 mm2) 8 ft (2.4 m) 16 ft (4.9 m) 24 ft (7.3 m) 32 ft (9.7 m)
16 AWG (1.31 mm2) 12 ft (3.6 m) 24 ft (7.3 m) 36 ft (11 m) 48 ft (15 m)
14 AWG (2.08 mm2) 20 ft (6.1 m) 40 ft (12 m) 60 ft (18 m)* 80 ft (24 m)*
12 AWG (3.31 mm2) 30 ft (9.1 m) 60 ft (18 m)* 90 ft (27 m)* 120 ft (36 m)*
10 AWG (5.26 mm2) 50 ft (15 m) 100 ft (30 m)* 150 ft (46 m)* 200 ft (61 m)*

* While in theory heavier wire can have longer runs, recommended household audio lengths should not exceed 50 feet (15 m).[4]

One more thing. Running a mono amplifier into two speaker cabinets will not give you a stereo rig. You need to have two separate amplifiers or a stereo power amp in order to run a stereo rig. You'll also need to have a stereo preamp (the VK212 is mono) in order to have two separate channels. You're simply running an extension speaker with a single Peavey VK212 as the power provider.
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