Originally Posted by ken78744
I have a code reader that let's me see real time rpms and timing advance so I could try and adjust it while it is running???
The sensor solves cylinder ambiguity for injection sequencing. It has no relation to spark timing.
Some of the earlier Jeeps with MPI (pre-TJ) had a casualty mode in which the ECM would guess which one of the paired pistons was on the compression stroke if there was no CMP input. When it guessed wrong, the engine would run, just not very well. So, if your engine runs well, there isn't much chance that your injection sequence is off.