MyChron4 660
User Manual
Release 1.03
www.aim-sportline.com
6
1.3 – How to install the RPM wire
The RPM wire has to be connected to the ON/OFF switch (kill switch). This switch
is usually a 2-poles switch (some switches are a single pole, but most are two):
one pole is COIL, the other one is RPM.
The RPM wire should be going to the coil side of the kill switch. Running it to the
grounded side of the switch causes the RPM signal to drop in and out and
sometimes not to work at all.
Because the ON/OFF switch is mounted on the opposite side of the bulkhead with
respect to the gauge, it is necessary to drill a 0.2” (5 mm) hole inside the
bulkhead.
Remember to insert the rubber wire-holder in order to protect the RPM wire
against tears and cuts.
While connecting the RPM wire to your MyChron4 660, please keep the
cable as far as possible from the temperature ones. If the RPM and
temperature wires are wrapped together, the temperature channels might be
very noisy.
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