Right above the oil filter.
On the 3.3L and 3.8L the sender is screwed into the oil filter adapter. Which is on the front of the block. On the 2.4L it is about halfway up the back of the block next to the transmission bellhousing.
1/4" NPT
on the block under the intake
The oil pressure switch and oil sender for older 454's are mounted on the lower left front of the engine block just above the oil pan.
The pressure sender is on the rear of the block, on the top...mounted on an "L" tube near and kindoff under the distributor. The oil temp sensor is on the side of the block, I forget exactly where...sorry. There is also a water temp sensor and a detonation sensor on the sode of the block....
The oil Sender is located on the rear of the block near the distribitor
Top side rear of the engine block next to the distributor.
Usually on a GM 350 the sender is on the lower left side of the engine block, under the exhaust manifold.
You would need a gauge that taps into where sender goes on block.
The oil pressure sensor screws into the block. It is mounted close to the oil filter and should be easy to reach.
on top of the block behind the intake manifold
It is located on top, at the back of the motor near the distributor. It is screwed into the block vertically.