Dash lights for my speedometer and tachometer do not work

Hi, also the fuel and temperature lights when the head lights are on. I have checked the fuses, the bulbs, tried another light switch. Dimmer switch, light module and a complete dash cluster from another car. All the other lights in the dash work, like high beam, park brake, driving lights, fog lights, oil light, etc. I took it to an Auto Electrician and he put a diagnostic scanner in the multi plug under the hood, but it could not read the light module to find a fault. Everything else in the car works like; interior lights, central locking, park lights head lights, indicators. Can you please help me to sort this out as it is not nice driving at night not knowing what speed I am doing. Thanks, Ross