Tachometer Gauge fits Allis Chalmers D17 D14 I400 D15 I40 70229755

What It Is

This is a replacement tachometer gauge that displays engine RPM for Allis Chalmers D17, D14, I400, D15, and I40 tractors. It’s designed for use on older model tractors, typically in farming or grounds maintenance.

Fitment & Compatibility

• Models: Fits Allis Chalmers D17 (series I, II, III), D14, D15 (gas or diesel), I400, and I40.
• OEM number: 70229755 (factory replacement). Confirm your existing gauge has this number.
• Measurements: Gauge face diameter is typically 2 1/8 inches. Check your dash opening to ensure it matches.
• Drive type: This is a mechanical, cable-driven tachometer. Verify your tractor has a working tachometer cable and that the cable end is the correct square or slotted drive.
• Mounting: Uses a standard clamp or bracket behind the dash. No special adapter needed for listed models.
• Aftermarket vs OEM: This is an aftermarket replacement, but reviews indicate it matches OEM specs. Not a factory Allis Chalmers part.

Key Things to Know

• Quality: Single review gives 5.0/5, but long-term durability on a mechanical gauge is unproven. Expect it to perform like a basic aftermarket unit.
• Installation difficulty: Moderate. You’ll need to remove the dash panel, disconnect the old cable, and route the new gauge. Cable not included—buy a compatible tach cable if yours is worn.
• Gotchas:
  • Will not work with electronic ignition or alternator-based RPM sensors. Only for mechanical cable drives.
  • Check that the cable’s inner square drive is not stripped at the gauge end.
  • If your tractor has a different dash layout (e.g., D17 with a separate hour meter), this gauge may not have an hour meter built in—verify before ordering.
• Accuracy: Mechanical tachometers can drift over time. No calibration adjustment is mentioned.

Should You Buy It

Buy this if you need a direct replacement for a failed mechanical tachometer on a listed Allis Chalmers tractor and your existing cable and drive are in good shape. Skip it if you want a digital gauge, need an hour meter, or have a non-listed model (e.g., D10 or WD). For $70, it’s a fair price for a basic, functional replacement.