1999 Ford F250 intake air temperature sensor

I just purchased a K&N after market FIPK for my 1999 F250 super duty and installed it. A day later, the check engine light came on. My mechanic said I need an intake air temperature sensor - but I haven't been able to find any for a '99 F250. I'm sure I haven't connected something right, but do I need an AIT sensor?

Thanks -