Behind the glove compartment, there's the fuse and relay panel. I don't remember specifically which one it is, but there should be a diagram on the back of the glove compartment door. It'll be the same for most FL models up to 2009, including the FLD132 (Classic XL), FLD SD ('Severe Duty' model, bearing some resemblance to the Kenworth T800), etc.
In order to find instructions on how to read the fault codes of a 2000 Freightliner FLD 112 with a C12 engine you should go to heavydutypowertrain.com where they have an extensive selection of instructional material including how-to videos.
It comes with whatever sized tanks the orignal purchaser ordered it with.
Fuses and relays will be behind the dash, accessible through the glove compartment door.
Try replacing the speedometer switch on the transmission.. that's probably your culprit.
It is the right arrow: p->fld means (*p).fld
Hook up a laptop with the appropriate software to read Cat fault codes.
For example: struct { int fld; } v[2]; v[0].fld = 1;
a quart is larger.
fld. or fd is probably your best bet
The arrow is used when a pointer variable is used to get at a member of a structure, and the dot operator is used when dealing with the real structure.ptr->fld == (*ptr).fldstr.fld == (&str)->fld
It is synovial fld that lubricates the joints of bodies.
Remove the screws, pull out with a trim puller.