Think I got the calc.pid figured out
*CLC-00-445
factor 10.00 20.00 .1 "{EXT.WO2AFR1}/{E38.AFRATIO_DMA}
CALC.WO2BEN_E38 F445 CLC-00-445 factor Tuning "BEN from Serial WB E38"
Looking at the log it seems legit
Now to figure out the MAF, looks as if my BEN wants MAF frequency but that PID isn't available, it only offers a lbs/grams PID
Edit- Looks like I can log GM.MAFFREQ2 so I'll try that and see what happens.