hi mate,pretty sure i can help you on this one,ive got 2x20v turbo bravos n they were both a ballache!!

haha anyway,wiring wise,if the 16v is anything like the 20v (ie..keycoded) then the easyiest way to do it is to just bite the bullet and remove ya dashboard and fit the full loom from the donor car mate,slicing wires is ok for vauxhall transplants because they can run off just a few wires,fiat are a bit more highly strung,well these engines are anyway.
i tried the whole splicing wires thing myself and it never worked (and i had a professional car electrician to do it!) and he never made it work either...
so we took out the dash and fitted the full loom and she fired straight up

trust me,,save yourself the time and effort and just fit the full loom,it so much easier,plus your diagnostic ports etc will work as they should,and you can never be sure if you got every wire correct,even if it runs something wont be right.I dont mind helping if i can mate,ps does anyone have a 20v turbo crank or short engine for slae????