7/8/2003 1000-208-00A
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
CALIBRATION
TwinScan 3” Instrument – Tachometer (LCD)
Gasoline Engines
TwinScan 3” Tachometers are unique in that they can be used on gasoline and diesel
engines. For gasoline engine calibration refer to the appropriate engine section, Inboard or
Outboard.
There are two calibration switches on the back of the instrument, Black and Red. Both are
required for calibration. If there’s an existing tachometer, or you know the engines’ idle RPM, you can calibrate the tachometer
without referring to Tables I, II, or III.
Decide on either Coarse or Fine Synch resolution. Coarse resolution shows that the engines are synched when they are running within
100 RPM, fine resolution shows synch within 50 RPM. Begin calibrating by putting the Black switch on 0 or 8, 0 is recommended.
Starting at 0, rotate the Red switch one, “click” at a time until you dial in the correct idle RPM.
•
If the correct RPM cannot be dialed in, refer to Table I, II, or III below.
Inboard Engines:
Tachometer calibration for standard point and electronic ignition inboard engines is usually based upon the number of engine
cylinders. EFI engines sometimes use a CPU to generate its tachometer signal. For these engines calibration is not always based on
engine cylinders.
Standard Point & Electronic Ignition Inboard Engines
Coarse Synch Display, (Recommended) Fine Synch Display
C
linders BLACK RED C
linders BLACK RED
4 0 1 4 8 1
6 0 2 6 8 2
8 0 3 8 8 3
EFI Inboard Engines
Coarse Synch Display, (Recommended) Fine Synch Display
C
linders BLACK RED C
linders BLACK RED
4
6
or 8 0 1 4
6
or 8 8 1
4 0 1 4 8 1
6 0 2 6 8 2
8 0 3 8 8 3
Table 1: 4-Cycle Gasoline Inboard Engines
Back of Instrument
Dial Lamp
0 0
Wires
Calibration Knobs
Black Switch Red Switch
