I am losing my enthusiasm for this whole deal.  May need a new ECU, they don't make the stinger any longer anyway.  I have a name of another dyno shop here local and may try them.

What engine do you run again?? Factory butchered harness??
There are a couple plug-and-play options out there for a Subaru using a factory style harness. Otherwise update to a modern stand alone ECU with all the options. Holly, Link, MS3 all do the same thing, it is how many inputs and outputs the board supports. I have run them all but keep going back to the MS platform because of the tuning software that runs it. (I cant stand the clunky feel of the holly terminator software)
https://www.diyautotune.com/product/ms3pro-mini-standalone-engine-management-system-w-harness/
This is the new MS3, excellent bang for the buck. Wire it in, set up your project, hit the MS forum and grab a base timing map and start tuning.

I haven't kept up with all that is available but I would consider Holley EFI. Not the base units though. I forget the name right now.I agree with DS about using a tuner that is very familiar with whatever you decide to use. That or learn to tune/log/tune/log/tune etc. yourself. I personally recommend that. If you understand tune basics ,and I think you do,it is not all that difficult. The bonus is that you KNOW your system when it tells you to pound sand.

I called Wichita dyno and they only work on domestic engines.  Maybe I didn't think this all the way thru.  I think I will just bolt a holley carb to it

Where is that can of worms? Oh there it is ,we already opened it..................

It doesn't need to be permanent. Use a slip on extension,sealed up well for the tune session. Remove it after the tune session,run in open loop. The drawback to not running an O2 is no compensation for varying air conditions/altitude. It will only consider throttle position and  and airflow or mass. It will not be able to hit target AFR's via the O2.