Maintenance ST700 Dash Display System
68
Reconfigure the system to the correct number of pulses per revolution.
Ignition systems may use multiple coils where each additional coil
gives proportionately fewer pulses per revolution.
Tachometer reading erratic, pointer jumps high or low
❑ Incorrect wiring
Reconnect the tachometer as specified in this manual
❑ Signal not intended to drive a Tachometer
Check for a more suitable connection point.
Use the ECU tachometer output signal in preference to the coil neg-
ative.
No Tachometer reading
❑ Incorrect wiring
Check the connection of the engine speed wire to the ignition system (or sen-
sor, if used)
See the instructions supplied in this manual. If connected directly to
the coil, check that it is to the switched low tension side (usually the
negative side).
❑ Signal not suitable to drive a Tachometer
Signal from ignition or ECU is only 5V. Select the low engine speed thresh-
old in the menu structure—see page 54.
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