Has anyone put one of these (Greddy Informeter) in an S13? I bought one and its supposed to plug into the OBD sensor plug or Old Nissan Diagnostic plug under the dash. I have an 89 S13 and the only 2 free plugs I see under the dash do not fit it. All the instructions are in Japanese so Im pretty much just following pictures but it seems pretty straight foward. If you could tell me where these plugs are it would help.