The 0 -1200psi 32 Degrees Mini Deluxe gauge has a diameter about equal to a quarter. So small and compact you'll hardly notice it's there. This gauge is more suited for markers that run high pressure from the box as most Spyder's and stacked tube blowbacks do. Since most high pressure markers run within a range of a relative 800psi, there'll be no need to worry about blowing this gauge due to over-pressurization. It may be easily mounted to a regulator, vertical adapter or any other place that has a standard 1/8" NPT threaded orifice. These fine gauges may be attached to any marker that runs within the pressure range of 0 -1200psi. It is suggested to wrap the threads with teflon tape when installing any gauge to ensure a proper seal.
For further info concerning how to add one of these gauges to your Spyder, check out the adding a gauge to a Spyder vertical adapter article in the paintball mod and tech info area of the SPPS website.