Oil Pressure

[dtr118]

I have a 77 GMC stepside 2wd, I swapped the 350 with a 327.  I got the engine to start yesterday but I do not register any oil pressure.  I bought a new oil pressure switch and installed it, still no pressure. I pulled the valve cover off while it was running and there was oil in the valves.  This truck has been sitting in my garage for about 10 years.  Is there a chance the gage went bad?  Is there another way I can check for Oil pressure?...thanks  This is my first engine install, so I am just learning as I go.
Greg

[Captkaos]

get a mechanical pressure guage and hook it up under the hood and check it.  Was the factory guage working before?

[dtr118]

Thanks for the response. The gauge worked fine before, Where do I hook up the mechanical gauge to? and what kind of a gauge do I use?...thanks

[Toolmaster]

You can pick up a mechanical gauge at any autoparts store.   Get a cheep one you can stick back in your tool box. (use it as a tool)
Hook it up where the pressure switch is plumbed in.
When you remove the switch check for any blockage in the block, use a flashlight and look into the hole.
Make sure no sealer is in the switch, hole inside should be clear of foreign matter.

[Lt.Del]

You can always check your pump by putting on a new oil filter.  Turn the engine.  See if oil filter fills w/ oil.   Foolproof way to see if oil pump works when putting in a new engine.