can you tell me wher the air temp sensor is
 

as you know i have an s12et in a kit car and megasquirt needs a air temp sensor, so i assume the engine has one already, could you please point me in its directing please:)

pic would be great too

Its effectively contained in the airflow meter, so you wont have an air temp fitted in that case. I bought a bosch air temp from DTA and it was about £20, but you could probably get one from a scrapper