Downloaded plane...no gauges??Help!

I've downloaded 2 aircraft from simviation (T33 and F84)
I've followed the instructions, the planes can be selected and flown but the cockpit view has no working gauges, just black spaces.
Any Ideas?
Thanks
Jonty
I've followed the instructions, the planes can be selected and flown but the cockpit view has no working gauges, just black spaces.
Any Ideas?

Thanks
Jonty