You need to manually rotate the engine and set the number one cylinder at Top Dead Center (TDC) before re-insalling the distributor. Hopefully, you made a mark on the distributor that relates its position to the engine in orde to re-install it as it was. If you forgot to make a mark, try to remember in which direction the rotor was pointing before you removed the distributor (assuming the engine was at TDC) and re-install it as close as you can. At TDC, the rotor normally points toward the number one spark plug wire post. Follow the firing order sequence from there.
Can't help you with that without knowing the year, make and engine info.
Your mechanic has put the distributor in wrong or he has the plug wires on the cap wrong.
It is built into the distributor and is not available without buying a distributor.
Pick up coil?
Since the computer won't work without both of them installed it doesn't matter which is installed first.
no
The crank sensor is not in the distributor, it is in the top of the bell housing. The cam position sensor is in the distributor and is not available separately
Without this, your distributor won't work. Without your distributor... :( Go to your distributor. On the outside of it you should see a plug with harness (?) feeding into the distributor. This is the beginning of your pickup coil "assembly". Take off your distributor cap. You'll see that "harness"/assembly feeds into the very top of your distributor, held by a "molded" grommet (on mine), then, it "coils" around the top and you'll see that it feeds (or plugs into) into some part of the distributor (again, you can only see this when your distributor cap is off). I'm basing all of this on my 84 CJ7. I have no clue if all distributors are the same. Good luck.
Most of the time it breaks off and you will need to drill it out and replace screew.
The oil pressure switch is located at the back of the engine next to the distributor. Looking at it from the front of truck it will be right of distributor. Normally it can be changed without removing the distributor.
No, not without OSx already installed.
you cant.