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I've seen gauges that use two probes and have a dual digital readout for egt's. They are primarily used on snowmobiles and four-wheelers, but would probably be what you're looking for if you're trying to monitor both at the same time. Due to how the thermocouples work and are constructed, I don't know if it would be a good idea or not to just use a switch, could affect the readout maybe... I've never done it before, so I couldn't say for sure.
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