inputs.text: really regret bought - plugged hud obdii socket 1997 ford f150 failed display speed engine speed anything else biggest complaint badly written instructions impossible procedure programming device enlarged tiny instruction slip six full pages could see fine print ambiguous illustrations functions buttons not obvious markings takes picture figure supposed like back arrow change miles per hourupdatei able test hud bmw 323i speed tachometer worked also instantaneous fuel flow temperature later hud failed display data chevrolet avalanche