hi digger you can get a cheepy kit for
www.oxycheq.com and put it in your own housing or i can give you a parts list!
www.ppo2 is a good place and mark has some realy good stuff but it is a little prisy after you shiped it from the usa!
or you can try your hand at a HUD go to this guys site,it a welth of info::
http://www.atlimp.com/hudparts.htm
if you need any help with the electronics just ask mate it's really no biggy.
best regards john routley