Continuing the discussion from OBD2 indicators, fuel level and gear:
I’m using an OBDLink SX with a android head unit. From what I’ve been able to gather, that SX unit supports ELM327 commands . My 2005 Silverado 2500HD uses J1850 VPW protocols (I think).
I was able to get a calculated fuel level but real dash displayed a full tank as ½ tank. I tried command monitor as you suggested. ATSP0 was good but 0100 &12F had no data. That leaves me with a calculated fuel level. Not the worst thing if it displayed properly. I have a 24 gallon tank but the quick settings only offer 16 gallons as full. Now I’ve made changes I cannot get the calculated feature to function( Displays empty with a full tank). I just want it to work. Any help would be appreciated.