Auto Meter 5646 User Manual
12V BATTER Y
INSTALLATION INSTRUCTIONS
ELITE SERIES
FULL SWEEP ELECTRIC PYROMETER
2650-1459-00
Important
Pyrometers are sensitive, high accuracy instruments. They must be handled and installed with care to insure proper performance. Carefully read and
follow these instructions, and your pyrometer will provide you with a long and accurate life.
Pro Control
OPTIONAL SLIT TUBING RECOMMENDED
(AVAILABLE AT MOST HARDWARE STORES)
Pro Control
High Output #2
Firewall
Grommet
White
Low Output #1
Orange
Blue
Red
Black
Black
Pro Control
Ground
CAUTION:
As a safety precaution, the
+12V terminal of this product
should be fused before
connecting to the 12V ignition
switch. We recommend using
a 1 Amp, 3AG fast-acting type
cartridge fuse (Littlefuse® #
312 001 or an equivalent).
+12v Dash
Lighting
Important: See "Lighting Mode"
(See Caution Left)
Fuse
+12v Connection
Good Engine Ground
NOTE: When the ignition is off the pointer may not always rest at zero.
INSTALLATION
1. Check that you have all parts required for installation, and the engine is cool.
2. Disconnect the negative (-) battery cable.
3. Gauge mounts in a 2 1/16” hole. Use supplied brackets and nuts to secure gauge to dash.
4. Drill 1” diameter hole where wires pass through sheet metal (such as firewall) and install rubber grommet provided.
(Grommet will require slit.)
5. Connect the white wire to dash lighting or switchable 12v light source, red wire from harness to +12V terminal on
ignition switch or other +12V power source, and black wire to ground.
6. Reconnect negative (-) battery cable.
PROBE INSTALLATION
1. Begin by installing the thermocouple in the exhaust, then work back to the gauge. Installing the probe in the proper location will
insure optimal temperature readings. For non-turbo engines, install the probe 1-2 inches from the cylinder head.
For turbo engines, remove the exhaust manifold and install the probe 1-2 inches from the cylinder head. If the exhaust manifold
cannotberemoved,installtheprobe1-2inchesaftertheturboexhaustoutlet(Exhaustgastempscoulddropover200˚when
installing after the turbo). CLEAN ALL METAL FILINGS out of the exhaust manifold. Metal filings will damage the turbo impellor
if they go through the turbo.
The probe can be mounted in two different ways, so please use the method best suited for your needs.
A) Pre-existing 1/8” NPT Threaded Hole: Simply screw the threaded fitting into the hole, insert the probe, and tighten the set
screw snugly onto the probe. (Caution: do not over tighten set screw or damage to probe may occur.) Make sure the probe is
oriented so the wires do not come in contact with, or become too close to the manifold or other hot engine parts.
See illustration for details.
B) Stainless Clamp Method: This method is for applications that require frequent removal of the manifold or header for service,
or just faster and easier installation. Drill a 7/16” diameter hole about 6” down from the junction of the exhaust pipe to manifold
junction. Undo the clamp and slide the probe into the hole in the clamp. Slide the set screw collar onto the probe.
Before tightening the collar in position make sure that when inserted, the probe will have its tip in the middle two-thirds of the
exhaust stream. Tighten screw collar in position. (Caution: do not over tighten set screw or damage to probe may occur.)
Hold the clamp open when inserting the probe into the 13/32” hole. Re-join the clamp ends and tighten in position.
Make sure the probe is oriented so the wires do not come in contact with, or become too close to the manifold or other hot
engine parts. See the illustration below for details.
2. With the probe installed, the wire harness can now be routed to the gauge. The wire harness is an integral part of the pyrometer
calibration. It may not be shortened or lengthened without affecting the gauge calibration. You will need to determine a suitable
location to coil the excess wire, and tie it loosely with a wire tie. (Loosely tying the excess coil prevents embritlement caused by
vibration.) Pass the harness through the fire wall using an existing hole, or drill a 1” diameter hole and use the rubber grommet
provided to protect the wire from damage.
A. Pre-existing 1/8” NPT Threaded Hole
SET SCREW
B. Stainless Clamp Method
PROBE
SET SCREW
COLLAR
STAINLESS
CLAMP
1/8” NPT FITTING
middle 2/3
Power-Up
The pointer will move counter clockwise to the stop pin and then moves to the current gauge reading. This procedure is an auto-calibration function
and is performed on every power-up. While this test is being performed, the gauge may make a clicking sound. This is normal.
Peak Recall
Press and hold the PEAK button to recall the highest temperature reading since the memory was last cleared. To clear the memory, press and hold
the PEAK button, and while still holding the PEAK button, press the WARN button. The pointer will move to the stop pin to indicate that the memory
has been cleared. Release the PEAK and WARN buttons to resume normal operation. The peak recall point is retained when power is removed
from the gauge.
Full Dial Warning
This gauge features full dial warning. When a warning point is reached, the entire dial illuminates in the programmed warning color. This feature is
available for both a high and low warning set point. In addition, the warning color will flash when an over warn point is reached.
Pro Control High Warning Set Point
To adjust the high warning set point, press and release the WARN
button. The warning light will begin to flash and the pointer will move
to the previous high warning set point signifying that warning set
mode has been selected. Once in set mode, press the WARN button
to move the pointer down, or press the PEAK button to move the
pointer up. Three seconds after the last button press, the warning
light will stop blinking and the pointer will return to the current
reading. The warning set points are retained when power is removed
from the gauge.
Pro Control High Over Warn Set Point
To adjust the high over warn set point, press and hold the WARN
button. After three seconds the warning light will begin to flash and the
pointer will move to the previous high over warning set point signifying
that over warn set mode has been selected. Release the warn button.
Pro Control Low Warning Set Point
To adjust the low warning set point, press and hold the WARN button,
and while still holding the WARN button, press and release the PEAK
button. The warning light will begin to flash and the pointer will move to
the previous low warning set point signifying that warning set mode has
Pro Control Low Over Warn Set Point
To adjust the low over warn set point, press and hold the WARN
button, and while still holding the WARN button, immediately press and
hold the PEAK button. After three seconds the warning light will begin
to flash and the pointer will move to the previous low over warning set
Change Backlight Color
To change the backlight color:
With power off, press and hold the warning button. Apply power to
the gauge. Release the WARN button. Press and release the PEAK
button. The pointer will move to half scale and the dial will illuminate with
Once in set mode, press the WARN button to move the pointer down,
or press the PEAK button to move the pointer up. Three seconds after
the last button press, the warning light will stop blinking and the pointer
will return to the current reading. The over warn set points are retained
when power is removed from the gauge.
been selected. Once in set mode, press the WARN button to move the
pointer down, or press the PEAK button to move the pointer up. Three
seconds after the last button press, the warning light will stop blinking
and the pointer will return to the current reading. The warning set points
are retained when power is removed from the gauge.
point signifying that over warn set mode has been selected. Release
both buttons. Once in set mode, press the WARN button to move the
pointer down, or press the PEAK button to move the pointer up. Three
seconds after the last button press, the warning light will stop blinking
and the pointer will return to the current reading. The over warn set
points are retained when power is removed from the gauge.
the current Backlight Color. Press and hold the PEAK button to cycle
through the available colors. Once you have selected the desired color,
release PEAK and don’t press any buttons for about three seconds. The
dial will flicker white several times to indicate the desired setting has
been saved and the gauge will return to normal operation with your new
color selection. Color selections are saved when power is off.
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