3-3/8' (85MM) ViewLine Synchronizer -500/+500 RPM - 8 to 32V - White Dial & Bezel On pleasure boats with twin engine installations, the ViewLine synchronizer is an indispensable aid to ensure correct synchronized running of both units. Specifications: * 8 and 14 pole Tyco / Hirschmann bush housing  * Operating voltage 8 – 32 V * Accuracy +/- 2.5 % of full scale reading * Anti-fog double lens * Protection rating front IP67, rear IP52 * 85 mm installation diameter * 50 mm installation depth * Operating temperature range -20 °C / +70 °C * Reverse polarity protection This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.