E36 Cluster Help

Hello

First port here so a big hello from me.

I've brought all the bits to make the E36 cluster work with the PC, cut a very long story short. I'm wondering if my dials might be faulty. When I connect them up, all the lights come on but the millage display remains completely off and all the dials go up a little, like the speedo goes to 20mph and the tacho goes to 800rpm etc, it does this even when only connected to power and not the Arduino.

Anyone seen this?

Thanks

dave