I have almost finished prepping my TBI harness for install but could not find the pin-out digram for the 7747 ECM. Anyone help me with the following wires?: Purple wire to ECM pin C9. Goes through firewall bulkhead conector (at fuse block). I think this is just a starter signal to ECM. Does it connect to starter circuit? Tan/blk wire to ECM pin D5. It goes back to the fuse block connector at firewall. I think this is the "set timing" wire, but I don't know why it goes back to the firewall??? Finally, the wires to the oil pressure sending unit: orange - I think this is ign "on" 12 v power tan/wht - I think this goes to pin B2 on ECM and is just a fuel pump signal to ECM. Again, why does it go to the firewall fuse block connector? Tan wire (to fuel pump??) Thanks for the help!!