oil pressure gauge and sensor installation instructions
OIL PRESSURE GAUGE AND SENSOR
INSTALLATION INSTRUCTIONS
1
 Disconnect batteries. Do not reconnect battery power until
system is fully configured to avoid risk of shock or fire.
2
Find a location where oil pressure can be measured, such as a test port
near the oil filter, or on the HPOP reservoir on a system with HEUI
injection. This may require adapter fittings to accommodate the ⅛”
NPTF sensor threads (ISSPRO R78844, R78877, and R78888 may be
purchased separately).
ICON KEY
 CAUTION
 Tools may be required
 Shown in picture
3
Install the new sensor. Pressure sensor threads are ⅛” NPT/NPTF.
4
If leakage occurs at the sensor, tighten one-quarter turn at a time until leakage stops. If necessary,
thread sealant such as Teflon tape may be used.
5
 Connect the pressure sensor to the pressure sensor harness by pressing the connector into
the slot.
 Many Emission Control Devices are connected to OEM sensors or switches. Be careful not to
disable these when installing a sensor.
 When using a torque wrench, tighten approximately 1.69nm/15 lb-in. or slightly more, if
leakage occurs. Do not use the body of the sensor to tighten! Use only the hex and the correct
wrench. Do not over tighten!
Figure 1: Pressure sensor and harness.
6
Route the sensor harness to the intended gauge mounting location, using grommets as appropriate
when passing through the firewall. Connect the sensor harness to the gauge connector as follows:
7
 Trim wires to desired length. The red/yellow, green, and black wires are the +5V, sensor,
and ground connection, and connect to cavities 4, 5, and 6 of the orange connector respectively (see
Figure 2).
 Install the three wires into the insulation displacement connector (orange connector). Carefully
lay the wires across the connector cavities, hold the connector steady with a vice or pliers and press
the wires into each cavity with a small screwdriver. Each wire must be pushed completely to the
bottom of its groove in the connector, to ensure a good electrical connection. Note that the 3
sensor harness wires run only between the gauge and the sensor, not connecting to any other power
or ground.
Form No. IS177 (Rev. G 05/26/2015)
ISSPRO, INC. • 2515 N.E. Riverside Way • Post Office Box 11177 • Portland, Oregon 97211-1899
503-528-3400 • 800-888-8065 • Fax: 503-528-3495
www.isspro.com
© 2008 ISSPRO, Inc. All Rights Reserved.
8
 An optional wiring harness is available (ISSPRO P/N R72022) to
simplify wiring and provide a potentiometer for reducing the brightness of
the gauge lights while still following the vehicle dimmer level. If this
dimming function is not required, you can substitute your own 18 gauge
wires in place of the harness, using a single wire in place of the orange and
orange/black wires. Connect one end of each of these wires as follows:
•
Ground – The black wire should connect to a clean ground on the
vehicle such as the battery negative terminal or a factory ground
bolt.
•
Ignition – The red wire should be connected to one wire of the
included fuse holder using the included crimp splice, and the other
wire of the fuse holder connected to a circuit that switches on with
the key switch. Install the included 1 amp fuse in the fuse holder.
 Use only 1 amp fuses, higher amperage fuses may cause
damage to the gauge or to the vehicle.
•
Dimmer – Connect the orange/black wire to the factory gauge
dimmer circuit by either tapping into the in-cab fuse block or by
connecting directly to the wire running from the dimmer on the
headlight switch.
Ignition (red)
Dimmer (orange)
Ground (black)
Pin Numbers
1
2
Sensor Power +5V (red/yellow)
Sensor (green)
Sensor Ground (black)
3
4
5
6
Figure 2: Connector.
1
2
3
4
Red
Orange
Black
Red/Yellow
5
6
Green
Black
Ignition
Dimmer
Ground
Sensor
Power +5V
Sensor
Sensor
Ground
Slide the white dust cover over the orange connector once the wires are securely installed.
Connect the red, orange and black wires to the orange connector as described above, in positions 1,
2, and 3 respectively. Slide the white dust cover over the orange connector once the wires are
securely installed. NOTE: The gauge backlighting will only illuminate if both the ignition supply
AND the backlighting circuits are on.
 The lighting harness is designed to be used with Performax EV² gauges. DO NOT
attempt to use this harness and potentiometer with any other gauge types.
OPTIONAL: Daisy Chain Your Gauges – If multiple Performax EV2 gauges are being installed in
one location (such as a pod), you may use a single set of the Ignition, Ground, and Dimmer wires to
connect all of the gauges. Simply pass the wires from one orange connector to the next one in a
“daisy chain” configuration. A single 1-amp fuse will protect up to 12 EV2 gauges.
9
 Install the connector onto the back of the gauge (angled portion on end
of connector pointing up as shown in photo), and then secure the gauge in
its mounting location. If drilling a mounting hole in a panel to mount this
gauge, the hole size should be 2.040”. Mounting Kit R19999 is available
for larger mounting holes up to 2.200”.
Pin #6
 NOTE!!! The orange connector MUST be installed in the direction shown. It is possible to force
it in backwards far enough to make an electrical connection which may damage the gauge!
10
 Secure all wiring so that it does not interfere with moving parts or chafe on sharp edges. This
may be accomplished by routing the wiring within the factory wire harness sheath, using wire ties
and sheathing, and using appropriate grommets when passing through the firewall.
Form No. IS177 (Rev. G 05/26/2015)
ISSPRO, INC. • 2515 N.E. Riverside Way • Post Office Box 11177 • Portland, Oregon 97211-1899
503-528-3400 • 800-888-8065 • Fax: 503-528-3495
www.isspro.com
© 2008 ISSPRO, Inc. All Rights Reserved.
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