Oil and water gauge issue, weird engine...help!

[cbbeard]

So my son and I are rebuilding a 1984 GMC stepside that my father found for very cheap. The downside is that the engine is a 1979 Oldsmobile 350. I know quite a bit about the Chevy 350, but the Olds is much different.

So here's the question...the water temp and oil pressure gauges don't work. So I'm wondering a couple of things...1) will the gauges work with the olds sending units etc? 2) if so, how do I test to see if the problem is the sending unit or the gauges themselves? 3) if not, any ideas?

I'm most weak in the electrical/wiring aspect, so any help is appreciated!