you dont and shouldnt need any sensor to swap.
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IF however you want to ditch the AFM and run on a map based setup, then you will need to wire in the AIT and MAT sensor
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(Cold start sensor for manifold temp, and ait for intake/induction temp) into the ecu,
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(thats all), ditch the AFM, fit a rev3 map sensor, then you should be good to use the other
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(rev3) MAP sensor option from the hand commander.
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this is why the ap is generally werth more, because you can convert and still use the same ecu and ditch the afm.
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if you try on a rev3 type apexi fc, only difference to the above is youll need to get a rev3 ignitor and rewire the ecu
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(and preferably fit larger injectors).
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i would check your wiring.
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(not that i wired my own, so i wouldnt be able to help with the specifics)