The tachometef, 966 072
has a rcd label oa irs back sid; drc new tacboEeter
966
()74
has the
same extemal
appeararce but a bluc
label
oa its back side,
The tachometer
will indicate corect
rpm
even if one of the two
ignition
systeDs is
tumed off
for ignition tcsting
proc€durc
or a transduccr failule happcns.
12.13) Calibration:
A calibration
potentioE€ter
is
located
insiate tho instruDenl Thc
adjusrmcnt hole
is
covered by a rcd
label
on tachometcr 996 072 and a blue label
on the tachomet€r
996 074. It
is
possible
to coEect the scale
factor
by colnoctiong the tachometer in
parallel
to a rEfererce instrumelt or
by
using a
pr€cisiotr
mechanical,
optical or
electronic tachometer.
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