Behind the distributor.
its at the back of the engine right side of the distributor
The oil pressure sender or switch is located at the rear of the engine, behind the distributor.
Mine is just to the left of the distributor (as you sit in the vehicle) but is hard to see it with the cruise control in the way.
How to remove ignition switch
Attach the wiring harness to the and of your 1986 Chevrolet Caprice ignition switch. Slide the ignition switch into the ignition slot. Tighten the ignition switch with the retaining ring.
Gm vehicles do not have an inertia switch.
The 1986 Chevrolet Caprice starter relay switch is located in the fuse box. The relay switch is the first large switch on the right hand side of the fuse box.
It is built into the switch and is not serviceable. You will have to replace the switch assembly.
Look under the dash on the 1996 suburban, and locate the brake light switch on the brake pedal arm. Remove the switch nut, and slide the switch out. Unplug the wires from the switch and install the new switch.
The relay switch for the locks on a 99 Chevy Suburban is located under the driver-side dashboard.