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You already have an Intake Air Temp (IAT) sensor built into the airbridge or MAF depending on the MY of your C5. I monitor the IAT using EFILive when I log data during tuning sessions. The IAT sensor is much more accurate and stable than the ambient sensor behind the fascia. Get a scanner that can log data from your OBDII port under the dash and you'll be ready to record all the incoming temps you want.