You get the guage wich will need to be mounted up by the other guages at the helm. Will need a standard 2 inch cut out for it.
One note, they do not have a on/off switch or inline fuse for the guage itself, so it's easy enough to do, just get a two way toggle and a inline fuse, then simply wire up the positive to a positive line to the battery and the negative to the boats ground buss bar or to the boat battery ground (buss bar is the way to go if you have one).
Then you run the trandsucer cable from the sensor up to the back of the guage. You mount the sensor "in-line" AFTER the fuel filter (if you have a Racor or spin on type fuel filter) as mentioned in the installation manual.
You simply cut the fuel line, then put the two stainless hose clamps (which come included) over the hose ends, then install the transducer with arrow indicator to show flow to the motor into the ends of the fuel hose, then clamp down both ends and yer done.
the hardest part is snakin the cable from the back of the boat up to the guage, other than that, it's so simple you'll wonder why ya hadnt done it sooner.
If anyone needs pics, let me know and I'll take some for ya and post them (might just do it anyway.....)