I'm not positive, but I think I had something similar happen with my blitz tt. If I remember correctly, there was an adapter harness that attached to the harness on the tt and then to the harness for the car.

I definetly remember doing this now, b/c I was confused when I got the harness for the car and ended up calling the company to figure out what the problem was.

I look into it see if I can find a receipt or something to vouch for this though

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EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
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