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Subject:Re: 81 Westy engine - does anyone know what this sensor is or does?
From:Bill Collins
Date:Wed, 23 Nov 2005 09:35:48 -0500

My '84 has one of those too.  I think it's a TDC sensor used with obsolete VW shop diagnosis equipment.  in the '70s VW advertised that their cars were equipped for computer diagnosis, but I have never really understood what that ment.

Bill