MH 3.75" (95mm) Tachometer 0–8000 RPM for 12V Gasoline – Black Dial, Adjustable Shift Light & 5-Level Backlight

The MH 3.75-inch (95mm) tachometer is a compact 0–8000 RPM gauge with an adjustable shift light and five-step backlight designed for 12V gasoline engines.

This compact black ABS tachometer gives drivers a clear, real-time readout of engine speed and a programmable shift alarm so you can monitor revs precisely. Built for 12V gasoline vehicles with 1–8 cylinders (not for diesel), the unit combines a red pointer, five selectable brightness levels, and an LED shift indicator to improve visibility and warning clarity in varied lighting conditions.

How do I change the brightness and make the display readable day or night?

Brightness is adjusted with a single short press of the central black button. Five distinct backlight levels let you adapt the gauge to bright daylight or dark cabins without distracting glare.

• Short press central button toggles five illumination levels.
• Red pointer and bright LEDs improve contrast against the black dial.
• Low setting reduces interior reflection at night; high setting keeps the dial legible in sunlight.

How do I set the shift alarm and what does it do?

The lower-left control sets the RPM threshold for the shift alarm; settings are adjustable between 2,000 and 8,000 RPM. When engine speed exceeds that preset value the SHIFT LED lights, providing a clear visual cue to change gears or limit revs.

• Rotate lower-left knob to choose the alarm RPM (2k–8k range).
• SHIFT LED illuminates when RPM goes above the set value.
• Useful for consistent shift points during spirited driving or track sessions.

Which engines and vehicles are compatible with this tachometer?

The MH tachometer is intended for 12V gasoline engines with 1–8 cylinders and requires setting the correct pulse ratio for accurate readings. It is not compatible with diesel engines, so confirm your vehicle type before installation.

• Designed for 12V gasoline cars with 1–8 cylinders.
• Not suitable for diesel vehicles—do not install on diesel engines.
• Pulse ratio must be configured based on cylinder count for accurate RPM display.

How do I install and configure the tachometer?

Installation ships with a mounting bracket and an instruction sheet; basic setup includes selecting cylinder count, adjusting backlight, and setting the shift alarm. Enter the cylinder setup by long-pressing the small button for six seconds, then use the controls to fine-tune brightness and alarm RPM.

• Long-press small button for six seconds to enter cylinder-number setup mode.
• Short press the small button to cycle brightness levels.
• Includes mounting bracket, accessory kit, and installation instructions for a standard 95mm dash cutout.

Who is this for: The MH 3.75" tachometer is aimed at drivers who want a compact, accurate RPM gauge with a visible shift indicator and customizable brightness—ideal for hobbyists, weekend racers, and anyone upgrading a stock dash on 12V gasoline vehicles. If you drive a diesel vehicle or need CAN-bus/diesel-specific electronics, this unit is not the right fit. For gasoline cars that require clear rev feedback and a programmable shift alert, the MH tachometer offers an easy-to-install, durable solution that improves engine awareness without overcomplicating setup.