I placed a traditional hobbs meter right underneath my whiskey compass and soon noticed that each time the 1/10th indicator on the hobbs clicked over, it made the compass swing. I really didn't want to move things around since I had holes in the panel, so I did some digging and came up with a digital hobbs meter. It's MUCH smaller than the meter I have now and shouldn't interfere with my compass!
Link to digital hobbs
Link to digital hobbs