Is the MS setup to read that type of wideband? You have to tell it which wideband you are using. also, there is a wait period, where it takes about 30 seconds to a minute until megatune starts to read wideband signal, are you waiting that long?
What caused it to stall out when you were running MS? Often, that happens from way too much fuel, and thats why it wont re-start. Did you log it? And when did it stop getting rpm signal? Was it something that happened right then? i’d find out why you’re not getting rpm, and then I would log you starting to crank it. Hopefully that will help.
–mark