J.P. Instruments Slim Line Gauges Installation Guide - Manual (Page 12)

INSTALLING THE SLIM LINE® INSTRUMENT SERIES PAGE 12 OF 14
REV B
the front is at the desired red-line. Adjust the alarm pot until the two red alarm lights just turn on or off. This is
the correct setting for the alarm limit.
Temperature instrument MP instrument
rear of instrument
+
red
black
gray
zero set (DO NOT ADJUST)
high set (DO NOT ADJUST)
alarm set
rear of instrument
nc + - nc
red
black
gray
high set (DO NOT ADJUST)
alarm set
zero set
Oil Pressure, Fuel Pressure and Boom Pressure Instruments Alarm Limit Set
Connect a 250 ohm linear variable resistor across the two pins
on the rear of the instrument. Apply +12 to the instrument’s
red power wire and ground return to the black wire. Adjust the
variable resistor until the reading on the front is at the desired
red-line. Adjust the alarm pot until the two red alarm lights
just turn on or off. This is the correct setting for the alarm
limit.
Volt/Amp Instrument Adjustment
To adjust the Volt/Amp instrument, follow this
procedure. Connect the red power lead, the gray
shunt lead (not the gray alarm indicator lead)
and the white shunt lead together and to a +12 or
+24 volt source. Connect the black lead to the
power return. Connect an external voltmeter
between the + voltage source and return. Set the
toggle switch to the voltage setting and adjust
the volts set pot until the voltage on the Slim
Line instrument matches the voltage on the
external voltmeter.
Set the toggle switch to amps setting and adjust
the amps set pot to indicate zero amps.
26) Manifold Pressure Calibration
The manifold pressure must be calibrated to the
ambient air pressure. You must adjust the instrument to
the current ambient barometric pressure. This setting is
not the same as the altimeter setting that you receive
from ATIS or unicom. It will vary with field elevation.
The engine must not be running.
If your field elevation is less than 500 feet, you can set
your altimeter to zero feet and read the ambient MP on
rear of instrument
red
black
gray
zero (DO NOT ADJUST)
alarm set
rear of instrument
red
black
gray
high set (DO NOT ADJUST)
alarm set
zero set
rear of instrument
V-A switch
white
+ sh
unt
gray
- shu
nt
+12
grd
red black
gray
amps set volts
set
power supply