SGI-8 rev. C
SIGNAL INTERFACE UNIT
This unit can recalibrate an ignition system tachometer signal.
Wiring:
PWR - 12 volt accessory power
GND - ground
Sig. In - Ignition system tach signal
(negative side of coil or tach output)
OUT1 - high voltage output for some tachometers
OUT2 - standard output to tachometer
OUT3 - not used
OUT4 - not used
OUT5 - not used
If OUT2 does not drive your tachometer, try using OUT1.
Switch settings:
1
switch ON OFF
#1 ECM tach signal Standard tach signal
#2 Standard tach signal Low volt tach signal
#3 #4
4 cyl gauge Off Off
6 cyl gauge Off On
8 cyl gauge On Off
10 cyl gauge On On
Tach input
si
g
nal
standard tach output signal
high voltage output signal
SGI-8 C
Dakota Digital
TACHOMETER SIGNAL INTERFACE
PWR
GND
Sig. In
OUT1
OUT2
OUT3
OUT4
OUT5
GROUND
12 volt accessory
power
#1 Input Type
#2 Sensitivity
#3 Gauge cyl
#4 Gauge cyl
Setup and diagnostic lights
RED GREEN Status
OFF OFF Power off.
OFF ON Power on, no tach signal present
OFF Flashing Power on, tach signal present
ON Flashing Engine cylinder calibration adjustment mode
ON ON UP switch is being held to preset cal
ON OFF DN switch is being held to enter setup mode
Calibration
Set DIP switches #3 and #4 for the cylinder count the gauge is designed for. Use the UP and DN
push button switches to adjust the engine cylinder count settings.
To adjust the engine cylinder count:
1. Begin with the key off.
2. Press and hold the DN switch while turning the key on. The RED light should be on.
3. Release the DN switch. The GREEN light will begin flashing the current engine cylinder count. It
will flash the current setting, wait, flash the current setting, wait, etc.
4. To increase the setting, press and release the UP switch. To decrease the setting, press and
release the DN switch.
5. When the GREEN light flashes the correct number of times, turn the key off.
Quick preset: You can also quickly set the engine cylinder count to 4, 6, 8, or 10. Hold the UP
push button while turning the key on. After setting the engine cylinder count, change the position
of switch #3 & #4 to match the gauge.
Set to 4: Turn setup switch #3 off, #4 off, hold the UP button while turning key on.
Set to 6: Turn setup switch #3 off, #4 on, hold the UP button while turning key on.
Set to 8: Turn setup switch #3 on, #4 off, hold the UP button while turning key on.
Set to 10: Turn setup switch #3 on, #4 on, hold the UP button while turning key on.
Setup example:
If you have a factory 6 cylinder tachometer and are now using an 8 cylinder engine, set the engine
cylinder count to 8. Turn switch #3 OFF and switch #4 ON to set it for a 6 cylinder tach.
Trouble shooting guide
Problem Possible Cause Solution _
Tachometer will not work. No power to SGI-8. Check the power and ground terminals
GREEN light off. on the SGI-8. Should be 11-15 V dc.
Tachometer will not work. No input signal. Test for 1-20 volts AC at the signal
GREEN light on steady. in terminal with the engine running.
SGI-8 set for wrong input Change the position of switch #1 or
type. switch #2.
Tachometer will not work. Wrong output type. Try switching from OUT2 to OUT1.
GREEN light flashing.
Tachometer will not SGI-8 set for wrong input Change position of switch #2.
read at high rpm. type.
Tech Support
You can contact us with any questions you may have by phone, fax, or email.
4510 W. 61ST St. N., Sioux Falls, SD 57107
Phone: (605) 332-6513 FAX: (605) 339-4106
www.dakotadigital.com
©Copyright 2004 Dakota Digital Inc.
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