| I used a double throw switch and honestly it was a waste of time in all the time I did that I always had one EGT gauge that was higher than the other using stock manifolds I believe it was the drivers side that always ran a 30-50 degres higher. I have now the defi gauges and defi link. And I have different manifolds now pentroof which are Equal length so I think I will have very small differential between the two. Maybe not all will agree but I think you don't really need two. Just like I don't think you really need 2 widebands. FYi I actually do have 2 thermocouples in my manifolds one on the defi system the other is for the innovative which I never I hooked up.

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