You sure its the right sensor? Mine hooked right up, except i needed an extension because the L67 map sensor is behind the SC whereas the GT is in front.
I have an L36 and L67 MAP, they both use three pins.
Just slightly different connectors.
Heres an L36 MAP, tells you which wire is which.
The L67 should do the same.
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use which ever one works.
No idea.
You only need one.