I measured the sensor voltage at the gearbox end. I will connect an analog meter at tha dash end of wiring loom with the loom plug connected. If my meter needle flickers simultaneously with the speedo I will know if loom or plug is faulty. The "Black Box" is the "Unified Meter Control Unit"...
Speedo problem Navara D22 3.0 Diesel 2005. Needle intermittently drops toward zero when driving. On a long trip the speedo if fine for 2-3 hours. The output from transmission sensor does not fail and ranges from 3-9 volts AC at different speeds. Could it be a fault around the black box on speedo...
