Qsi Gauge Wiring Diagrams; Tachometer Wiring Diagram - Mercury 150 EFI Service Manual

WIRING DIAGRAMS

QSI Gauge Wiring Diagrams

Tachometer Wiring Diagram

Tachometer dial on back side of case must be set to position number 4.
WIRING DIAGRAM A
Use this wiring diagram when using a separate light switch for instrument lighting.
a -
b -
c -
d -
WIRING DIAGRAM B
Use this wiring diagram when instrument lighting is wired directly to the ignition key switch.
(Instrument lights are on when ignition key switch is turned on.)
a -
b -
c -
Page 2D-12
b
a
Connect to +12 Volt
+12 Volt Light Switch Wire
Position Light Bulb to the Switched Position
Connect to NEGATIVE (–) Ground
a
Connect to +12 Volt
Position Light Bulb to the Unswitched Position
Connect to NEGATIVE (–) Ground
c
d
51106
b
c
51106
90-883728 JULY 2001