5 lights on (track off, vsc track, ABS, brake, check light)

Speedomoter/odometer out. Diagnostic under dash indicated speedo sensor. Checked contacts and swapped that out. Did not work. Pressure checked for leaksin vaccum/emission lines in front as well as running back under spare. Track lights went off then came back on. Put on loaner o2 sensor.
, changed gas cap.

is there anything else I can check before my worst fear of the module by brake master cylinder is screwed?