If you are unsure of the exact Tach calibration number for your engine, experiment. If your calibration number
is currently set at 2 and the RPM displayed is double what it should be, set the calibration number to 4.
Alternately, if the RPM displayed is half of the correct value, decrease the calibration number to half the current
number.
How the Tachometer Reading is Displayed
The Tach displays RPM in thousands of RPM. For example, if your display shows 9.50, your RPM is 9500.]
B. Monitor Mode is Used While on the Track
When your instrument is powered on, it is in Monitor mode. This is the mode the unit will be in so you can
observe your Tach function. During Monitor mode you can make quick tuning adjustments to your powertrain
that allow you to run safe and fast. The instrument will visually warn you, by flashing the display, if your
engine exceeds it’s set limit. This limit allows you to avoid engine damage.
The backlight is used to illuminate your display for use at night. Press the
LIGHT
button to toggle the backlight
on or off. The backlight can only be turned on or off while in Monitor mode. The engine must be running for
the backlight to be on.
Electrical Interference
If the instrument encounters excessive electrical interference it will display ERR on the left side of the display.
The ERR annunciator can indicate an incorrect instrument or sensor installation. Severe electrical interference
can cause the Tach limit and calibration to reprogram themselves. If your instrument is doing strange things, put
it in Set Limits mode and check to see that the limits and calibration number are still where you set them.
Electrical interference problems can normally be solved by installing a
resistance plug boot.
We recommend
using an NGK boot, # LB05EMH.
To avoid erratic readings:
•
Route the lead as far away from the ignition coil as possible.
•
Running your lead through a section of fuel line will protect it from cuts and abrasions, but will
not
shield it
from ignition generated interference.
Be sure that the
sensor and the connector fit together snugly.
Troubleshooting
The following are explanations to some commonly asked questions.
What are those letters on the side of my display?
There are two annunciators that may be displayed on the left side of your display.
RPM
stands for Revolutions per Minute, also called Tach.
ERR
stands for Error and could mean that your instrument has encountered extreme electrical interference. This
can possibly cause the instrument to reprogram it’s limit and calibration number.
Why is the Display Flashing?
This signifies that you are either in Set Limits mode or that your engine exceeded it’s limit.
Repairs
If you have any questions about the operation of your instrument, please call. One of our technicians will be
happy to help you.
Your instrument is warranted to be free from factory defects and electronic failure for one year from the date of
purchase. Physical damage during normal usage is not covered under the warranty. Be sure to fill out and return
your warranty card for our records. If we do not have a card on file for your instrument, you will be charged for
repairs unless you can provide us with proof of purchase date.
When returning an instrument for repair, please use the repair form found on our website or enclose a note
indicating your return address, phone number and a detailed description of the problem. Send your instrument
and sensors so that we can check the complete system.
Send repairs to:
Digatron LLC
120 N. Wall St. Ste 300
Spokane, WA 99201
www.digatronusa.com
Phone: (509) 467-3128
Fax: (509) 467-2952
5/7/2008
