Erik,
1) Ditch the dash, if your worried about the electrical side of things, leave the wiring alone, and where the loom runs through the dash, just get a hacksaw blade and cut the dash out carefuly.
2) fuel injection pipes may look confusing, but theres only an extra return pipe needed on the tank ( most injection set ups anyway).
3) providing you use some decent heavy duty rubber fuel pipe, injection need not be a problem, dont skimp on jubilee clips either, buy the best you can get and try using two clips where you would normaly only use one.
I used to race PI Triumphs, and I never had any problems with fuel leaks or fires. In fact I can only ever remember one PI Triumph going up in flames on the track ( someone elses car), and that one, once the pipe was done back up, drove off the track to be fixed for its next race.