o.k my car was a speed density,and the owner before convert to mass air,"BUT" did not have thermactor pump EEC hook up so i did it 51 to 38,-and-11 to 32. Start the car up, RPM at 2000, and red header in 4 min's of run. My MAF wiring to EEC connector are, -A 37 power,-B 40 ground,-C 9 signal return,-D 50 signal, header red. Now i put -D to 9,and -C to 50 start car, RPM is 900, no red header, i was thinking o.k this is good,"but" now i got code 66 air flow (maf/laf signal low -ckt gnd car was off on test, and test car running 66 no maf sensor signal ? I was thinking of putting -C to 40 ground, and see what would happen ? has any one did the coversion?and if i need a new EEC computer should i go with A9P?