Caerbont Automotive Instruments Ltd, Abercrave, Swansea, SA9 1SH.
Tel 01639 732200 Fax 01639 732201
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Electronic Programmable Tachometer (EPT) Fitting Instructions (New Design)
IMPORTANT INFORMATION
Gauge to be fitted to NEGATIVE EARTH VEHICLES only.
Application Notes
OPERATING VOLTAGE 11-17VDC NOTE: instrument is equipped with a 12v lamp INPUT SIGNAL:- Contact breaker ignition (coil) ECU tachometer output COMPILES WITH 95/54/EC, ISO7637 & ISOTR 10605
Installation
Calibration
Calibration Procedure
Set the switches to the correct values for the number of cylinders. (Refer to the table below) Locate the setting, then set the switches marked "O" to "OFF" (down)
Petrol Engines

No of Cylinders

Pulses/Rev

Switch 1

Switch 2

8

4

On

Off

6

3

Off

On

4

2

Off

Off

2

1

On

On

Calibration Switch Settings
Switch 3 - OFF, unless Tacho outputs on some ECU'S and some sensors require resistive load to 12 volts to operate (open-collector output) Turning Switch 3 ON will provide this. Switch 4 - NOT used for calibration and should be switched 'OFF'

Caerbont Automotive Instruments Ltd, Abercrave, Swansea, SA9 1SH.   Tel 01639 732200.  Fax  01639 732201

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