AEM X-SERIES BOOST GAUGEEasier To Read: Visual improvements include a bright center LED display that is 87% larger than our original digital gauges and provides better readability. A sweeping green LED needle lines the edge of the gauge face for quick reference. A 33% overall increase in the gauge face display makes it easier to see at a glance. Easier To Mount: Despite the larger display, X Series Gauges are contained in a standard 2 1 16th inch (52mm) diameter housing for