I seem to be having an issue. I need to do some data logs for TRM to revise my tune, and I need to tap into the analog 5v signal from my AEM wideband sensor (white wire). The problem is, when I check the signal voltage with a DMM, it gives me about 0.8v. It jumps around a little, but regardless of if I am max rich or max lean, it doesn't change much. I am using a clean chassis ground source for my other lead. Anyone have experience with this, or an explanation as to why I am not getting a 5v signal?

Could it be because the signal is changing so fast and it is taking an average? I am using a high quality fluke multimeter.