Premium Series Gauges (Peak Recall/warning) Blue/White 52mm(2 1/16") Premium Gauges feature a fully programmable Warning function and have a Peak recall ability. "We Don't Need No Stinkin' Controller" Stepper Motor Driven 270°LED Display. These are fully programmable to allow you to set the warning feature to either beep or change color (or both) once the gauge reaches your pre-set limit. 270° dial sweep provides quick one glance accuracy. Track tested and race proven these gauges use precision electric senders to keep hazardous fluids out of the passenger compartment. All of our Premium Series gauges perform a dramatic opening ceremony with a full pointer sweep each time the vehicle is turned on AND off. These are very easy to use, all programming is done from the front push button! Wire up the first gauge for power and daisy chain the power to each gauge as needed! As only Prosport would do, the Daisy chain power leads come with them! Nothing more to buy. These Gauges are Super Thin! Perfect for tight mounting options:Less than 1.25" Behind the Bezel (Including the studs) This ELECTRICAL Boost Gauge will perform a pointer sweep/self check on start-up & shut down! If your vehicle is supercharged or turbocharged then this gauge is simply a must have. For peak performance you need to know how much boost you are making at maximum RPM's. Now you can track your peak boost as you modify your ride! Save your Turbo-Set the warning function to alert you when you over boost!! (-30~30 PSI includes Mounting Cup, Tubing kit, T-Adaptor, Electric Sender, quick connect pigtail wiring, Visor, Decal and Instructions) "THANK YOU SOOOOOOOOO MUCH!!!! Not only do your gauges kick ass but so does your customer service. I don't think I ever had such quick and detailed responses as I have received from you. Thanks Again! Adam Spinney* *Proud owner of 2003 Mazdaspeed Protege with ProSport EGT, Oil Pressure & Boost Gauges!!! *We now have these in Metric scale*