JVC KD-NX10 Manuel D'instructions page 195

Mechanical speedometer with built-in speed sensor in the speedometer cable
• Remove the signal from the speed sensor, extend and connect to
socket pin 1.
A
• Minimum requirement for the signal:
0 Hz - 4 kHz / square-wave signal (no inductive sensor)
Low - level < 1.5 V, high - level 5 V - 16 V
If you do not know the exact installation position / location of
the speed signal, please consult the vehicle manufacturer.
Mechanical speedometer without speed sensor in the speedometer cable
A speed sensor must be built into the speedometer cable to generate a
digital speed-dependent signal.
The VDO Adapter 2152.30300000 or a vehicle-specific adapter that
fulfils the minimum requirements can be used. The VDO speed sensor
is suitable for direct installation on the gearbox (no further installation
parts required) or in the speedometer cable (in conjunction with addi-
tional universal installation parts).
If the sealed speedometer cable is released, a correct display
cannot be guaranteed. Incorrect installation leads to improper
functioning of the navigation system or of the speedometer.
Installation/Connection Manual
A
GAL signal
193