Siemens VDO, Installation And Operation Instructions Manual, Page: 10 / 12

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2. Run a series of wires from the ammeter
location through the firewall to:
a) the shunt
b) the positive (+) terminal on
the alternator;
c) the positive (+) terminal on
the starter;
d) the positive (+) terminal on
the ignition switch;
e) the light switch (also after the
fuse in the fuse box); and
f) a good ground location (i.e.,
where the negative (–) battery
pole is bolted to the chassis of the
vehicle).
3. Please see the caution described in Dia-
gram C. In wiring the starter and alterna-
tor to the shunt, you must use wires of the
same gauge as those installed by the manu-
facturer.
4. Connect the proper wires to the shunt,
starter, ignition, alternator, ground and to
the ammeter as shown in Diagram D.
5. Wire the light socket as shown in Dia-
gram D, making sure the positive (+12)
lead comes from the light switch, after the
fuse box.
At this point, the installation and wiring of
your shunted ammeter is complete. Turn
on the ignition and start the engine to be
sure the ammeter is working properly. If it
isn’t, recheck your wiring.
Diagram A
Gauge dimensions
Mounting hole dimension = 2
¹⁄₁₆
" (52 mm)
PD[ PP
PP
é
P
P
PP
P
P
Diagram B
Proper mounting using VDO’s Spin-Lok
ä
Mounting Clamp
Mounting Nut direction
depends on panel width
A: 0 – .4" (0 – 10 mm)
B: .4" – .8" (10 – 20 mm)