OBDII connector and 5500rpm rev limit

[benz-tech]

edit:

Fixed thisI need to find out what wire from the DME goes to the obd2 connector under the dash so that i can plug in a generic scan tool).

I'm still having an issue with having a 5500rpm rev limit but figured checking codes (P0500) is a good plsce to start. For starters, I knoe the speed input(it is now), rear o2, fuel tank pressure sensor and DISA valve are not connected yet. Anyone know if any of these things could causea lowrev limit? It's not misfiring, just hitting an unusually low rev limit. The sound from my big cams is just getting warmed up at that rpm and want to keep going.