Mercury - Quicksilver Power Trim Sender Kit For MerCruiser MC-I, R, MR, Alpha & Bravo Drives 805320A03. Overview. Your trim gauge is only as accurate as the sender behind it. The Mercury Marine 805320A03 Quicksilver Power Trim Sender Kit keeps your MerCruiser sterndrive's trim system working right, giving you precise gauge readings and smooth trim control. Designed for MC-I, R, MR, Alpha One, Alpha One Gen II, and Bravo sterndrives, this OEM sender provides reliable communication between the dri