Delsolburger

Hey ppl.. i hav a b20 setup wit a b16 head and Using JE pistons. I just did a top overhaul of the head and now i think my air-fuel mixture is a bit off. I know this cos im using an apexi turbo timer n wen cruising.. d air/fuel diplays jus blinks green n red. is it a wiring problem or wot?only wen i take my foot of d pedal does it stay green n displays d air/fuel mixture which sometimes goes alarmingly to 20:1 instead of 14:1. a fren of mine says i should get a sard fuel regulator n a HKS AFR to tweak d mixture. is dis correct?