Intermittent electrical faults on dash

Intermittent electrical faults on dash. After about 2 Kim's the ABS light and a triangle light located between speedo and rev counter activate. The speedo and fuel consumption indicator stops working. The fuel gauge and Kms remaining to fuel tank level are both erratic. Had a diagnostic done, indicated dash cluster and ABS sensor. Auto electrician had car for 4 days we paid $500 nothing fixed. Details of work ( scan vehicle check fault codes cannot fault. L/rear wheel sensor raise vehicle hook up scope test ABS sensor ok remove instrument cluster send away to be repaired, install cluster road test ok. Suspect ABS unit is faulty as the units are known to fault i.E. Speed signal (speedo, abs, traction control light) ). The faults are still intermittent but at the same time. Any advise.