All MaxxECU can use an external source for EGT type-k measurement using external electronics.
MaxxECU STREET does not have built-in EGT amplifiers like MaxxECU V1/RACE and PRO.
Wire an external 0-5v amplifier to available MaxxECU analog input.
External EGT-K module, product ID: 1790.
See, External EGT wiring.