New heart! RB style

drove it today! HOLY SH!!T this thing is a beast compared to what I used to run. I did manage 7 psi and blew the boot off the intercooler. I have my WG set up with a 7# spring so I got to here that blow. I will probably end up plumbing it back into the exhaust or put a honda muffler on it! hahaha. Still have some wierd stuff going on with my fuel pressure. I had it set at 6 lbs. Started the car it was at 4. Figured Ill just keep a eye on things. Took off AFRs stayed right around 12-13 cruising jumped on it and it the AFR went to 10 the FP went to 15 and stayed there. The AFR went back to 12-13 cruising although the FP hung at 15. finished my short cruise and shut it down. restarted and my FP was 6#.. WTF? My gauge messed up? its been a good gauge for 14 years and now it acts up??