After driving my truck for 20 minutes or so, when i come to a complete stop or decelarate, the check gauges light comes on and the oil pressure drops to zero. I checked my oil levels, and it was fine. I was think of the oil sending unit or switch, only i do not know where to locate these or how to uninstall or install one. I also checked my coolant, brake fluid, and power steering fluid. If anyone could help me that would be great. I took a auto machinest class in high school but we were taught to assemble a old chevy engine and i dont remeber a oil sending unit. Please help.

 

Oil sending unit is right behind the intake manifold, to the left of the distributor.

 

Thanks, do you think this is the problem?

 

if your fluid's are good, that's where i'd start.

 

Very common problem and more often than not it is the sender.

 

There is a wire clip attached to it, that needs to be removed then all you do is grab it and twist it off. Mine broke in half when I did this, then I just used a socket on it. The new one goes in the same way.

If I remember right there were two sensors there and it was the closest one to to the dist. I just took off the wire clips and found out witch one fit. If you aint done it in a while, change out the cap and rotor while your back there, it was a hell of a lot easier to get to it when I took it off.