Mercury - Trim Analog-to-Digital and Limit Kit SmartCraft Conversion 8M0118725. Overview. Analog trim systems work well, but when you upgrade to SmartCraft gauges, the signal needs to speak the same digital language. The Mercury Trim Analog-to-Digital and Limit Kit (8M0118725) handles that translation cleanly. It takes the analog trim position from the engine and turns it into the digital output your SmartCraft display expects. It also adds an upper-limit function, giving you control over the ma