Simple to use Morgan vacuum  gauges  that allow you to set up the balance of your 4 injectors or carburettors. Comes with simple detailed instructions and will save you money instead of paying your dealer for adjustment. Great if you like to do your own major services on FJ's or interim 6000 mile services inbetween the big 12000 and 24000 mile intervals on FJR1300's, as this is the only really technical piece of equipment you need to do the job properly.