Harbor Freight Tools 98478 Product manual
LED VACUUM
GAUGE WITH
98478
BOOST
INSTRUCTIONS AND PRECAUTIONS
Distributed exclusively by Harbor Freight Tools®.
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our website at: http://www.harborfreight.com
SAVE THESE INSTRUCTIONS. READ ALL
PRECAUTIONS AND INSTRUCTIONS.
Copyright© 2008 by Harbor Freight Tools®. All rights reserved. No portion of this document or any artwork contained
herein may be reproduced in any shape or form without the express written consent of Harbor Freight Tools.
Diagrams within this document may not be drawn proportionally. Due to continuing improvements, actual product
may differ slightly from the product described herein.
For technical questions or replacement parts, please call 1-800-444-3353.
UNPACKING
When unpacking, check to make sure that
the item is intact and undamaged. If any parts are
missing or broken, please call Harbor Freight Tools
at the number shown on the cover of this document
as soon as possible.
IMPORTANT SAFETY
INFORMATION
Assembly Precautions
Assemble only according to these instruc-1.
tions. Improper assembly can create haz-
ards.
Wear ANSI-approved safety goggles and 2.
heavy-duty work gloves during assembly.
Keep assembly area clean and well lit.3.
Keep bystanders out of the area during as-4.
sembly.
Do not assemble when tired or when under 5.
the inuence of drugs or medication.
Use Precautions
This product is not a toy. Do not allow chil-1.
dren to play with it.
Use for intended purpose(s) only.2.
Inspect before use; do not use if loose or 3.
damaged.
Only use in accordance with State, local, 4.
Federal and D.O.T. laws and regulations.
Disconnect vehicle battery negative post 5.
before installation.
Positive and negative connections can not 6.
touch. If you are unsure of how to install this
product safely then have a qualied mechanic install the gauge for you.
Insulate connections to prevent re.7.
Maintain product labels and nameplates. 8.
These carry important safety information.
If unreadable or missing, contact Harbor
Freight Tools for a replacement.
ASSEMBLY INSTRUCTIONS
Read the ENTIRE IMPORTANT
SAFETY INFORMATION section at the
beginning of this document including
all text under subheadings therein
before set up or use of this product.
Assembly
A round 2-1/16” wide hole with at least 2-1/2” 1.
clearance behind is needed to install this
gauge.
At least 18 AWG stranded copper wire must 2.
be purchased for the installation of this
gauge.
Disconnect vehicle battery according to 3.
manufacturer’s instructions. Some vehicles
with air bags or other systems may require
precautions before disconnecting the battery.
Consult your vehicle’s service manual.
Route and secure wires and vacuum tube as 4.
needed to attach the Gauge to the desired
area; avoid sharp edges and hot spots.
Dashboard Lights
On some vehicles there is a factory provided 8.
tapped hole in the intake manifold that is suitable for connecting the vacuum hose using
the included 1/8” NPT barb tting. Connect
the vacuum hose to the tting just installed
(if used) in the manifold. NOTE: The tapped
hole may require the use of a 1/4” NPT
adapter (not included) to connect the 1/8”
barb tting to the manifold.
Vacuum
Gauge
Vacuum
Tubing
Install the meter into the hole. Attach the 9.
bracket onto the back of the meter and
tighten.
Reconnect the battery according to the 10.
manufacturer’s instructions. Verify that there
are no short circuits before reconnecting.
Ensure that the line has no leaks and is not
near any parts that will get hot during opeeration. Check for loose strands of wire and
direct contact with grounded components.
Use a multimeter with a continuity function to
help verify that there are no shorts to ground.
Start the vehicle and turn the dashboard 11.
lights on. LED should light up. Be ready to
disconnect battery if arcing or sparking occurs at the meter.
To change the color of the LED light, push 12.
the button on the face of the gauge.
Fitting
T-tting to
manifold
hose
Original Manifold
vacuum line
Record Serial Number Here:
Note: If product has no serial number, record
5. Wiring:
BLACK wire connects to Ground.•
WHITE and ORANGE wire connects to •
vehicle’s dashboard lights or other switch.
Connect the vacuum line to the tting using 6.
the compression sleeve, as shown in the following diagram.
Connect the other end of the vacuum line 7.
to the intake manifold side of any vacuum
booster equipment.
month and year of purchase instead.
Note: No replacement parts.
SKU 98478 For technical questions, please call 1-800-444-3353. Page 2
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