Installation

Disconnect battery during installation.

Tighten nuts on backclamp only slightly more than you can tighten with your fingers. Six inch-pounds of torque is sufficient. Over tightening may result in damage to the instrument and may void your warranty.

Gasket cement or other adhesive is not required to secure tubing to fittings.

Description

The dual engine synchronizer is designed to indicate engine synchronization extremely accurately when the speeds of the two engines are compared to each other. Engine synchronization may be difficult at idle speeds. For proper operation, both engines must be of the same type, have the same number of cylinders, and have similar ignitions. Malfunctioning ignition systems or high speed "point bounce" will result in inability to sync properly.

1. Location: The synchronizer should be located at least 18" from a magnetic compass. Some interference (erratic operation) may be noticed on the synchronizer during radio transmissions. This will neither damage nor degrade it's performance.

2. Be certain to use stranded, insulated wire not lighter than 18AWG that is approved for marine use. It is recommended that insulated wire terminals, preferably ring type, be used on all connections to the gauge, except the light which requires a 1/4" female blade terminal.

3. Cut a 3-3/8" dia hole in the dash and mount the gauge with backclamp supplied.

4. Using a small screwdriver, SLIGHTLY depress and turn the selector switch on the back of the synchronizer to the correct position to match the engine application. (See label on the side of the synchronizer.) Depressing the switch too hard may cause damage to gauge! Be sure the selector switch has locked into the detent at the correct position by slightly rotating the switch back and forth with the screwdriver.

5. If this gauge kit has been supplied with a three prong connector, slide the connector over the three instrument studs. Be sure the gray, yellow, and black bullets are connected to the gray, yellow, and black wires of the main engine harness.

6. Connect the gray extension lead stud connector to the positive (+) post of the synchronizer and plug the bullet end into the gray wire of the main engine harness.

7. Connect the yellow extension lead stud connector to the STARBOARD signal (SIG) post terminal of the synchronizer and plug the bullet into

the yellow wire of the main engine harness.

8. Connect yellow/red extension lead stud connector to the PORT signal (SIG) post terminal of the synchronizer.

9. Connect the black extension lead stud connector to the negative (-) post of the synchronizer and plug the bullet end into the black wire of the main engine harness.

10. Connect the GREEN/ORANGE extension lead to the blade terminal adjacent to the twist-out light assembly to the positive “+” side of the instrument lighting circuit and the bullet end to the boat lighting circuit. No separate ground is required for the lighting. Reconnect the battery.

11. Calibration: This gauge has been calibrated at the factory, and should never need adjustment. However, If you are experiencing problems refer to the Calibration section at the end of this manual.

12. NOTE: To change the light bulb, twist tan socket assembly one-eighth turn counterclockwise until it pops out. Bulb pulls straight out of socket assembly. It is a GE No.194 instrument lamp.

Mounting Hardware Kit

A	x 6
B	x	6
C	x	2

A A C B A

990C0-86B40, 86W41 specifications

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