Usually next to/above the oil filter, although I have seen them screwed into the main oil galley that runs down the bottom drivers side of the block in the front just above where the oil pan and block come together -- sometimes they are screwed into an angled fitting that points the sending unit away from the belt(s) at a 45 degree angle. A 7.4 is a big block so I'm not sure why this question is posted under "chevy 350", and 350's don't have the main oil galley running down the side of the block at the bottom on the drivers side -- just a little FYI.
how to install the oil pressure gauge on a Chevy 350 small block
On the engine block. where on engine block?
Yes it can, you will also need the big block pickup tube
Yes it has an oil filter. You will find it on the engine block somewhere.
Bottom of the engine block on the oil pan.
Attached to the engine block inside the oil pan.
Inside the oil pan mounted on the engine block.
35ft. lbs.
Right above the oil filter.
A Chevy big block uses a Chevy big block oil pump regardless of what kind of car it's in. A standard volume (original equipment) oil pump for a big block Chevy is a Melling M77: A high volume oil pump for a big block Chevy is a Melling M77HV: TRW, Federal Mogul, Wolverine, Speed Pro/Sealed Power, etc. all have their own part numbers for basically the same pumps as listed above.
Mounted on the engine block inside the oil pan.
The oil pressure switch on a 1998 Chevy Blazer is on the side of the engine block. It is located above the oil filter.