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All you need to do is cut a hole on both the inlet and outlet of the cat. Weld temp probe bosses onto these holes. The afertreatment systems in diesel engines have them because the ECM is constantly monitoring temps. Temp probes are generally straight thread with an angled metal to metal seal where they seat in the boss. The aftertreatment temp sensors that I work with are thermocouples and are fairly cheap, maybe $80 each. You would just need to interpret the signals. I can get the Cummins part number if you want.
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