Lower the tank, pop out the old one and pop in the new one. A little lubrication helps.
There is no "oil cam sensor". There is a oil pressure sensor and a cam sensor, but they are two different sensors.
The 2002 Chevrolet blazer speed sensor is located on the side of the transmission. The speed sensor will be on the right hand side of the transmission.
Unplug it, remove the bolt that holds it in then take it out and install new one.
A 2002 S10 Blazer doesn't have throttle body injection (tbi).
It still has a distributor.
The 4.3L engine in 2002 should have 60 to 66 psi of fuel pressure.
Was that the only code that caused you to replace it? Do you have it close enough to sense again.
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pass.side at exe manifold Bank 1 is where cylender 1 is. Bank 2 is on the other side of which is on the passenger side of the blazer. Oxygen sensor 1 is the first sensor closer to the front of the blazer. Sensor 2 would be past the catalytic converter on the same side.