I've just installed some gauges into the heater control slots:
http://farm1.static.flickr.com/211/5...00715c3bf4.jpg
I've removed the heater all together, so no need to worry about the controls, although I do need to purchase a heated screen.
Since all Novas use the same loom (redundant wires are tapped up) and since I have just a warning light for the oil pressure, I was able to unravel the exact wire for the oil pressure, so simply plugged that into the gauge and it worked.
I spliced into the water temp wire. I was going to run the wire straight to the new gauge, but I didn't like the idea of glancing down to see the water temp on the dash not reading at all.
The volt meter was connected using one of the exsiting wires to the now redundant heater controls. In fact, it worked out really nicely, as the gauges use the brown and black wires from the heater controls to light them up :)
http://farm1.static.flickr.com/231/5...a10ade6056.jpg
