Hiya
Some 1.3 Golfs ran on a standard 2e carb system, as used in the 1.6 or 1.8 drivers. However some were fitted with digijet (code NZ) injection, which is NOT the same as the digifan (code PB) found the late 8v GTI's.
According to the Haynes manual "The system is regulated in accordance with instructions recieved from a control unit, located in the bulkhead plenum chamber on the left hand side. This unit was modified in July 1989 and can be indentified by a blue sticker on the unit, earlier units having a copper-brown sticker."
So depends on if it's running on a carb or on the digijet fuel injection.
If you're still unsure post back or PM me and I'll try and email you the section from the haynes, with piccies and diagrams to match up.