Volvo VHD - Manual (Page 82)

76 Instruments and Controls
Main Instrument Section
G Tachometer ( this page)
H Speedometer ( page 77)
J Master Warning Telltale ( page 78)
K Warning Telltales ( page 79)
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G — Tachometer
The tachometer is electrically driven by a
signal from the engine. Monitor the
tachometer to guide correct gear shifting
and to prevent engine overspeeding when
descending steep grades. Each engine has
its ideal operating ranges for power and
economy. Read the engine manufacturer’s
manual to find out the best ranges for each
engine.
CAUTION
Always keep an eye on the tachometer
during downhill runs. Do not allow the
engine to over-speed. Excessive engine
over-speed can result in serious engine
damage.
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