Mercury – Active Trim Kit (Without Trim Pad) | Mechanical MerCruiser | Dual Engine | 8M0129458Mercury Active Trim Kit (Without Trim Pad) Mechanical MerCruiser Dual Engine 8M0129458 Overview The Mercury Active Trim Kit (8M0129458) provides full automatic trim control for dual engine mechanical MerCruiser sterndrives, giving you smoother handling, faster planing, and better fuel efficiency all managed through your VesselView display instead of a physical trim pad. Designed for 4. 5L and 6. 2L 300350 HP mechanical sterndrives, the system