I used Autometer Procomp II, bought them about 4 years ago and they have been brilliant.
Speed gauge got left standard
5" tacho fits in the factory hole, but im not 100% happy with the fitment as it slides in from the front, not neat from the back like th espeed gauge
3 x 58mm (i think) fit well across the centre of the dash. I have Boost/Vac, Oil Pres, Coolant Temp.
I then put a fuel gauge on the right hand side in the air vent (it fits nicely). Yuo cant see it at a glance, but fuel level isnt exactly something you need to check repeatedly on the fly.