IS0015G ECR7155 11/2007

CAUTION: Disconnect the battery duringinstallation. Tighten nuts on the backclamp onlyslightly more than you can tighten with yourfingers. Six inch-pounds of torque aresufficient. Over tightening may result indamage to the instrument and may void yourwarranty.

1. Location: The tachometer should be locatedat least 18” from a magnetic compass. Someinterference (erratic operation) may be noticedon the tachometer during radio transmissions.This will neither damage a Faria® tachometernor affect accuracy when not transmitting.

2. Be certain to use stranded, insulated wirenot lighter than 18AWG that is approved formarine use. It is recommended that insulatedwireterminals, preferably ring type, be used on allconnections to the tachometer, except the light,which requires a 1/4” insulated female bladeterminal.

3. Switching Diesel: The diesel tachometersender (90901 or equivalent) must be used inconjunction with switching diesel tachometers.One sender will operate two tachometers.Mount the sender to the engine at themechanical drive take-off using the correctdrive tip (supplied to properly engage thesender).

Variable Ratio Alternator & Switching Diesel Tachometer - Tach/Hourmeter

Installation Instructions

IS0015G ECR 7155 11/2007

4. Using a small screwdriver, SLIGHTLYdepress and turn the selector switch on the backof the tachometer to the correct position to matchthe engine’s tachometer drive take-off ratio (seelabel on the side of the tachometer). Depressingthe switch too hard may cause damage to thetachometer! Be sure the selector switch haslocked into the detent at the correct position byslightly rotating the switch back and forth withthe screwdriver. If the drive ratio or alternatorpole count is not known, consult the enginemanufacturer and provide them with the correctmodel, horsepower, and year of manufacture ofthe engine. Alternator tachometer applicationwill require further calibration as noted insteps 10 - 13.

5. Cut a 3-3/8” dia hole in the dash and mountthe tachometer with the backclamp supplied.

6. Connect a wire to the tachometer studmarked “GND” (ground) and secure with a nutand lockwasher. Connect opposite end to theboat’s electrical ground, generally available inseveral locations at or near the instrumentpanel.

7. Connect a wire to the tachometer studmarked “BAT” (battery) and secure with a nutand lockwasher. Connect the opposite end to a12VDC circuit that is activated by the ignitionswitch.

8. Connect a wire to the tachometer studmarked “SIG” (signal) and secure with a nutand lockwasher.A.) Switching Diesel:Connect the opposite end to the gray wire of thediesel tachometer sender. Connect the blackwire of the diesel tachometer sender to theengine ground.B.) Variable Ratio: Connect the opposite end to the boat’s alternator signal output. Consult your engine manual for its location and proper color code.

9. Connect the blade terminal adjacent to thetwist-out light assembly to the positive “+” sideof the boat’s instrument lighting circuit. Noseparate ground is required for lighting.Reconnect the battery.

10. Remove the weather seal plug located in thehole marked “ADJ”.

11. Run the engine at a known RPM over 1000and nearest to cruise RPM as possible. RPM’scan be established with a mechanic strobe lightor accurate test tachometer. CAUTION: Donot exceed maximum, recommended RPM.

12. Carefully vary the adjustment pot (throughthe hole in the case) with a flat blade jewler’sscrewdriver,( Some models may have a 5/64 ths or 1.4 mm Hex.) untill your Faria Marine Instruments tachometer is in agreement with theknown RPM.

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13. Replace the adjustment pot weather sealplug and your calibration is complete.

NOTE: A.) To change light bulb, twist blacksocket assembly one-eighth turncounterclockwise until it pops out. Bulb pullsstraight out of assembly. It is a GE No. 194instrument lamp.

B.) If your Tachometer is equippedwith an hourmeter, the hourmeter will beenergized when the engine is running.