Hey,
That is your problem, but I know how hard p13 are to find. If you take it to a race shop, they should be able to convert it for you. I bought a p28, and the buyer lied to me and said it was manual. So I had a Auto p28 I had PYR fix make it a manual ECU. He charged me 20 bucks. I would not advise trying it yourself. Only let a knowledgable person inside te ECU, or else you might end up with a broken ecu
Josh