Random drops in oil pressure when i press on the brakes

[ChevLoRay]

Long-standing rule of thumb says, "10-lbs of oil pressure for each 1000RPM's".

My '67 Impala had a 283, that was well past its prime. Cloverleaf ramps would make the idiot light come on if it was a quart low. The fact that I had to put non-foulers on some of the plugs just proved how much past rebuilding/replacement it really was. But, it never failed to start and it always got us where we were going, and back.

When the top was down.....who knew?

If your oil pressure goes UP when you let off of the gas...that's supposed to be a sign that there is wear on your main bearings.

But for the sake of knowing...I too would look at your sending unit as well as the wire to it. If the wire is original to the truck, there could be a crack in the insulation or missing insulation that lets the wire ground out momentarily. Look for a slack spot in the wire and check where it goes thru the firewall.