[Gmecm] Check Engine Light Wiring / Oil Pressure Sensor Wiring, '88 S-10

[Aphelion79]

Ok all... back to my Jeep which is now running wonderful thanks to all 
of you who helped me figure out how to set the timing! =D  The only 
remaining two "problems" I have... is now I just need to figure out how 
to wire the Check Engine light... I can't find any wiring schematics 
that show anything about where it should plug in to! 

Also there are 3 wires coming out of my Oil Pressure sensor... one wire 
says it goes to "instrument cluster".  I tried that wire and my oil 
pressure gage shot up to 80 LBS (the upper limit) when I turned the key 
to "on" it went back to 0 and didn't move after I started it... Should 
this sender shoot out the same amount of volts as my old oil pressure 
gage?  Can I use my OLD sender and have no problems?  (Looking at the 
wiring diagram it appears possibly that when there is no oil pressure 
the fuel pump will not run?)
Engine Wiring Schematic:
http://members.cox.net/aphelion79/enginewiring.pdf 
<http://members.cox.net/aphelion79/enginewiring.pdf>
If so, would it be safe just to run the gray and orange wires together?

Body Wiring Schematic:
http://members.cox.net/aphelion79/bodywiring.pdf