How to fit a greengauge tachometer
CAI Electronic Programmable Tachometer (EPT)
Introduction
The EPT can be programmed to accommodate 4, 6 or 8 cylinder engines and to accept inputs from Contact Breaker Ignition Systems and Electronic Ignition Systems.
IMPORTANT INFORMATION
- only to be fitted to negative earth vehicles
- disconnect your vehicle’s battery prior to installation
- operating voltage is between 11 & 17 volts DC – NB the tachometer is fitted with a 12V lamp
- the Tachometer complies with CE regulations regarding electro magnetic compatibility
Input Signals
The EPT can accept input signals from: -
- Contact breaker ignition system , from the low tension side of the coil.
- Electronic Ignition Systems.
Programming Your EPT
- Make sure that the battery is disconnected.
- Make sure that your vehicle is negative earth.
- Determine number of cylinders.
- Determine input source, i.e either contact breaker or electronic ignition.
- Remove the black hole plug on the rear of the tachometer, by pressing it inwards, just above it’s centre, and then inserting a small coin or screwdriver into the edge of the plug.
- Removing the plug will reveal 6 switches.
- To programme the number of cylinders the switches should be set as follows:-
| No of Cylinders | Switch1 | Switch 2 | Switch 3 |
| 4 | Off | Off | On |
| 6 | Off | On | On |
| 8 | On | Off | On |
- To programme the input signal the switches should be set as follows:-
| Input Signal | Switch 4 | Switch 5 |
| Contact Breaker | Off | On |
| Electronic Ignition (type a) | On | On |
| Electronic Ignition (type b) | Off | On |
- Please note that there are two types of electronic ignition, one of which generates it’s own voltage output from it’s tachometer connection (type b) and the other which requires the tachometer to act as a power supply (type a).The switches need to be set accordingly.
- Switch 6 is never used, in this application.
Installation Of Your EPT
- A hole is needed in the fascia panel,the diameter of which will depend upon the tachometer purchased, with sufficient clearance behind to accept the body of the tachometer.
- Check that the battery is disconnected.
- Wire the tachometer as follows:-
- Green Wire– Connect to power source via a 3 amp fuse
- Black Wire– connect to earth/ground
- Brown/Slate Wire– not used in this application
- Red/White Wire–power for the tachometer lamp, connect to a dash lighting power feed.
- White/Black Wire– for use with Electronic Ignition only, connect to the output side of your electronic distributor - please note NOT THE OUTPUT SIDE OF THE AMPLIFIER. Otherwise not needed.
- Red/Blue Wire– for use with contact breaker ignition systems, connect to low tension side of the coil. Otherwise not needed.
- The tachometer can now be installed in the fascia panel hole, and clamped against the back of the panel using the fixing clamp, spring washers and knurled nuts supplied.
- N.B. if the tachometer is totally inoperative at this point, when tested, and you have an electronic ignition system, it is well worth checking the settings of switches 4 and 5, and determining whether your system is type a or b. A simple way to check is to meter the voltage output from the electronic ignition, tachometer connection, if voltage is zero, then you have type a, any kind of voltage detected would indicate type b. Make sure that switches 4 and 5 are set according to the table in item 8) of the programming instructions.
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