How to get the fuel sender level to be seen by the obdII (Page 3/3) Fie Ro SEP 21, 10:55 AM So, did anyone had succes with this mod? I am looking to do this too and want to know if it works. And what about pin 35/C2 sensor ground, does it need to be connected? I know that pin is shared with some AC/autotrans sensors which I don't use so I removed it (can put it back). Does the pcm need that as a sort of "reference" ground, and if yes can it be connected to chassis ground just like the fuelpump/sender unit? Not sure how all this affects a correct ohm reading..