Owner manual
INSTALLATION INSTRUCTIONS
2
1
⁄
16
" DIA. ELECTRIC TACHOMETER
®
2650-972A
Mounting
1. Can be mounted in a 2
1
⁄
16
” dia. hole in the dashboard.
(Take care that hole is not cut too large.) Can also be
mounted in a standard aftermarket street rod panel.
2. Cut a
3
⁄
8
” dia. hole in the firewall where the tachometer
wires will be routed. Place rubber grommet in hole
and route the connector wires through to the engine
compartment.
3. Connect the tachometer wires as shown below.
4. Secure the tachometer in the dashboard using the
bracket, thumbnuts and lockwashers provided.
1
1
1
2 2 2
UP
UP
UP UP
DN
DN
4 CYL / 2 PULSE
6 CYL / 3 PULSE
8 CYL / 4 PULSE
Calibration
4 CYL. - Switch One up, Switch Two down.
6 CYL. - Switch One down, Switch Two up.
8 CYL. - Both switches up.
Switch
IMPORTANT
This tachometer is factory calibrated to operate on 8 cylinder engines.
For 4 or 6 cylinder engines, it is necessary to make the proper
adjustments to adapt this tachometer to your cylinder range.
NOTE
This tachometer has an air core meter. The
tach pointer may not always rest at zero. This
is normal. When engine is started, pointer will
position on the correct RPM.
To change the calibration of the tachometer, remove the twist in light
socket assembly to access the cylinder select switches. The switches
are located to the left of the light hole. Use a small screwdriver or an
unwound paper clip to change the switch settings.
Unwound
Paper Clip
1
9
⁄
16
”
2.2”
QUESTIONS:
If after completely reading these instructions you have questions regarding the operation or installation of your instrument(s),
please contact Auto Meter Technical Service at
815-899-0801.
You may also email us at service@autometer.com.
Additional information can also be found at
http://www.autometer.com/tech_faq.aspx