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AEM Water / Methanol HD Controller The AEM Water Methanol Injection Controller is a progressive type controller. This means thatfluid will be injected in proportion to the amount of boost that is detected by the internal MAPsensor. In other words, more boost equals more fluid. It is therefore imperative that thevacuum/pressure connection be made properly and securely or vehicle/engine damage couldoccur. In addition, the controller will automatically compensate for any fluctuations in batteryvoltage variations to ensure consistent flow under all conditions. Features On-board Status LED Externally accessible fuse System function test button Short circuit self-diagnostics Applications Universal Downloads User Guide