Google is your friend: This might be a partial clue
Yamaha Golf-Car Company | Specialty Vehicles Vehicles- Personal Security Vehicle
"Fuel Gauge/Hour Meter
A patrolman’s best friend, this dash mounted analog fuel gauge features a large, easy to read face and comes complete with a digital hour meter to log vehicle running time."
Now what I did not locate is what is the utility of logging run time? Perhaps a call to the sales department where you bought the cart can educate all of us. Also not clear is where do you get the actual running time as opposed to the hour glass suggesting that it is being recorded somewhere.