Sherman Hill SD-40 Gauges Aren't Working

I thought the gauges on this engine were working, but evidently not so. In fact, the main reservoir needle has disappeared.
I tried the engine alone and with other engines, and still get the same results.
Is there a fix for this?
Thanks,
Rob

I tried the engine alone and with other engines, and still get the same results.

Is there a fix for this?

Thanks,
Rob
