[Vern]

If the motometer IS repairable, Williamson's Instruments in Arkansas can repair it. Often, the small bulb at the end of the tube is missing or damaged. They can replace or repair them and "tune-up" the meter. It won't be quick and may be pricey depending on what the condition is. I've had three or four re-done and have no hesitation recommending them.
It's worth looking them up & giving them a call.