Hi - I've got a Mk 1, to which I fitted an Xe retaining Vauxhall fuel injection ( Motronic 2.8 - no dizzy ).
Any more info on the problem?
Fuel pressure?
Sparks?
History - Did it run?
Fault codes? - listed on the topbuzz site.

I found the following very helpfull :-

http://www.timandgail.pwp.blueyonder...t/vauxhall.htm
www.vaux-md.net/injection/( pages on testing the injection system)
http://www.topbuzz1.carenthusiasts.c.../gf50/gf50.htm

I used a Haynes manual for the wiring - quite straight forward and good fun when finished.

I'm just finishing of this winters project, now it has a Mini cooper supercharger and water injection fitted. It's running and should be on the road on May 1st, and in a ditch on May 2nd !

Good luck