5/21/2004 4001-100-00I
FloScan Instrument Company, Inc.
Tel: (206) 524-6625 Fax: (206) 523-4961
3016 NE Blakeley Street, Seattle, WA 98105 email: service@floscan.com http://www.floscan.com
Tachometer Wiring Information applies only to MFI & TwinScan Instrument Tachometers
Tachometer signal wires on MFI & TwinScan Tachometers should be shielded.
For proper tachometer operation on gasoline EFI engines, (especially outboards) the engine Ground wire must be physically
connected to the MFI or TwinScan instrument ground wire.
Note: FloScan recommends using dedicated 18 AWG shielded cable for tachometer signal wire connections. Always, “Ground” wire
shields or the shield drain wire in the engine room by connecting to the bonding system or engine block.
MULTI FUNCTION & TWINSCAN INSTRUMENT TACHOMETERS for
CARBURETOR & CLOSED LOOP EFI GASOLINE ENGINES with POINTS or STANDARD ELECTRONIC IGNITIONS
Inboard, & I/O Engines: Connect the YELLOW wire from pin # 8 to the distributor coil’s negative terminal. On twin engine systems
the Yellow wire from pin # 8 connects to the port engine, the VIOLET wire from pin # 16 to starboard.
Outboard Engines: Outboard tachometers are connected to either the engine alternator or tachometer signal wire. Connect the
YELLOW wire from pin # 8 to the engine alternator or tachometer signal wire. On twin engine systems the Yellow wire from pin # 8
connects to the port engine, the VIOLET wire from pin # 16 to starboard.
MULTI FUNCTION & TWINSCAN INSTRUMENT TACHOMETERS for
CLOSED LOOP EFI GASOLINE ENGINES with CPU IGNITION SYSTEMS
Inboard, I/O, & Outboard Engines: Connect the YELLOW wire from pin # 8 to the engines’ tachometer signal wire. On twin engine
systems the Yellow wire from pin # 8 connects to the port engine, the VIOLET wire from pin # 16 to starboard.
Outboard Engines: Connect the YELLOW wire from pin # 8 to the engines’ tachometer signal wire. On twin engine systems the
Yellow wire from pin # 8 connects to the port engine, the VIOLET wire from pin # 16 to starboard.
MULTI FUNCTION INSTRUMENT TACHOMETERS for
OPEN RETURN EFI GASOLINE ENGINES with CPU IGNITION SYSTEMS
Inboard & I/O Engines: Connect the YELLOW wire, pin # 8 to the engines’ tachometer signal wire. Connect the VIOLET wire, pin #
16 to ground.
MULTI FUNCITON INSTRUMENT TACHOMETERS - DIESEL ENGINES
•
Keep existing tachometer: Connect the YELLOW and VIOLET wires to the existing tachometer signal wires. If one lead is
grounded at the pickup or alternator, connect the YELLOW wire to the tachometer signal wire. Connect the VIOLET wire to a
ground buss.
•
Replace existing tachometer: Connect the YELLOW and VIOLET wires to the existing magnetic pickup or signal generator. If
one lead is grounded at the pickup or alternator, connect the YELLOW wire to the existing signal wire terminal at the tachometer
and connect the VIOLET wire to a ground buss.
•
Install as a new tachometer. On engine alternator installations, connect the YELLOW wire to the tachometer output terminal
(usually marked “tach” or “sig”) and connect the VIOLET wire to a ground buss. For mechanically driven A-C signal generators
and magnetic pickups, connect the YELLOW wire to one terminal and the VIOLET wire to the other.
TWINSCAN INSTRUMENT TACHOMETERS – DIESEL ENGINES
•
Connect the YELLOW wire to one terminal the Port tachometer sender, (AC signal generator, Magnetic pickup, or the engines’
alternators tach or sig terminal). Connect the VIOLET wire to the Starboard sender. The tachometer senders’ second terminal
must be grounded.
FINAL ACTIONS
Check Electrical Installation: Test all connections. Support and secure all dangling wires. Start engine and calibrate system.
