where is and how do i change my oil pressure sending unit is it difficult time consuming thanks

 

On some SBC's its down above the oil filter. On some it's by the distributor, threaded into the back wall of the block.

FWIW, I used the tee off an 86 iroc on my 86 Monte. REmoved the above - oil filter one,and used the one by the distrib. For z-bar clearance

 

It should be at the back of the engine near the distributor. It's a barrel type object probably 2.5" long about 1.5" wide. Unscrew it, screw in the new one. Ultra simple.

 

thanks guys