im doing a complete re wire of the car does it have to be a 1.8t loom an fusebox or will a 1.4 fit
Are you putting a 1.8 T engine into a 1.4 then ?
If you're doing a swap like that, you will need a matching loom for the 1.8T.
The loom and the fusebox will be different as the 1.8T lump has a whole load of different stuff to connect to, especially a different ECU, clocks and engine sensors.
Check out Ashmond's project thread, he put a 1.8T into his Mk4 1.4, so it shows what he had to do:
http://www.golfgtiforum.co.uk/index.php?topic=58241.0