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I have a 1987 speed density car that I'm going to change to mass air. I have the computer and the meter calibrated for stock injectors. I picked up a wire harness from a 1994 mass air car and was wondering how I would go about merging or replacing this harness? Is it even possible, or did I just waste my money? Any information would be appreciated
 

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yeah take the mass air plug and 4 wire pigtail out of the 1994 harness and wire it into the 87 harness,then throw the rest of the 94 harness in the garbage

then get yourself a mass air computer(A9L,A9P,A3M,A9M,etc),cuz you'll need to replace your SD computer

find the mass air sensor in this diagram,and trace/install the wiring to the corresponding PINs on your EEC 60 pin connector
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif
 
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