You could try Bruce at powrmax he was very helpfull,had the serial cable in stock and sent straight out
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If that doesn't work out, do you have a DB9-ended cable from your AEM...? If so, see this: showthread.php?t=9340 post #3
Thanks guys, I'll try Bruce at Powermax and if he cant help me out I think I can make my own with the link you posted joecar
Thanks again
Chris