i'm currently in the midst of doing a OBD 0 ls motor swap in my friends 91 hatch. its throwing code 4, but all i have found in here is a crank angle/position sensor. if we are believing correctly, OBD 0 doesnt come with a crank angle sensor. so any quick help would be appreciated.

 

would like to find this out tonight if at all possible. not trying to post ***** or anything.