gun 10 water gun 10 includes a chamber 11 that receives water via a cap 12 the chamber 11 can be pressurised upon reciprocal movement of a pumping piston 13 in a known manner a trigger 14 can be depressed and held down to result in ejection of squirted water via nozzle 15 trigger 14 opens a valve to allow pressure within chamber 11 to force water through the nozzle 15 in a known manner a pressure indicating gauge 16 is mounted to the side of the toy gun 10 forward of the trigger 14 components of the pressure gauge are illustrated in the remaining drawing figures the pressure gauge 16 includes a housing made up of a back part 17 an intermediate part 18 and a front part 19 all of which are typically fabricated from moulded plastics material the back part houses a light globe 20 receiving current from a battery not shown via a pair of electrical conductors 21 and a switch also not shown the battery would be housed somewhere within the toy gun 10 and the switch would he somewhere on the toy gun exterior or on the pressure gauge itself the back part 17 includes an integral bushing 22 through which a shaft 23 extends a pinion gear 24 is fixed to an externally projecting end portion of the shaft 23 whereas a transparency disk 25 is mounted to the other end portion of the shaft behind the intermediate housing portion 18 a wall 26 of the intermediate portion includes a blind hole 27 to support.