Help, where does the nut/sensor the EGT gauge get connected to, get welded?
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Pre turbo is more accurate as its closer to the piston and you will lose a lot of heat through the turbo hence 550C is your safe limit post turbo. You can run 2 it wont hurt and will give you the temp differential pre and post turbo. Pre turbo safe temps i think can be up to 750C. How efficient your turbo is will be what varies the temperature differnce.