Gauge or panel for Posky 742

Has anyone found a panel and/or a gauge with a fuel gauge that properly shows the total fuel (or fuel for each tank) for airplanes such as Posky's 742? The plane has 6 total fuel tanks. I am looking for anything which shows the total fuel load preferably in gallons or pounds. I am looking for something for a classic panel without a full glass cockpit. I fly using Lago's FS Maintenance, and when running that program, you are not allowed to open up the fuel window under the aircraft menu. So I have no way of telling how much fuel is onboard once the flight starts. The only gauges I have found only work for 5 digits and doesn't show properly above 99,999. Thanks,