Distributor Wiring

What are the four wires in the harness on the distributor of a 1991 B2600i. They go to the sensor in the distributor but what do they do, what do they control??

i controls the dizzy firing order and all that also shows your rpms. yeah i need one cuz mine broke so now my truck dont run.lol

i might still have a dizzy for a 91 b26i in my garage... not sure where, but i replaced my dizzy thinkin that was my problem a while back but fount it to be something else...

If you still have it could you let me know and what you'll take for it. Mine is shot.

ill check thru all my piles of stuff in the garage and ill let you know...