@JodyS21 my understanding is that unless you have a PID on a gauge then it's not reading it. I also agree with you that both should be available and that's what I've done, however I'm not reading the PID a second time to run in though ABS, but rather using a "Virtual PID" to re-process the existing data. As you can see, no PID is being read in the third column of the second row in the below example:
"MG Vehicle Speed Actual","Speed","0x22ba00","(INT16(A:B)- 20000)/100",-200,200,"km/h","7E3","","",1
"MG Vehicle Speed","Speed",,"ABS(VAL{MG Vehicle Speed Actual})",0,200,"km/h",,"","",1