Component Testing: Tachometer
Connect a known accurate tachometer to negative side of the ignition coil. Start engine to compare vehicle tachometer reading with test tachometer. See TACHOMETER ALLOWABLE VARIATION - 323 MODELS or TACHOMETER ALLOWABLE VARIATION - 626 MODELS chart for tachometer allowable error.
TACHOMETER ALLOWABLE VARIATION - 323 MODELS
| RPM Indicated | Allowable RPM Range |
|---|---|
| 1000 | 1000-1050 |
| 2000 | 2000-2050 |
| 3000 | 3000-3050 |
| 4000 | 4000-4050 |
| 5000 | 5000-5050 |
| 6000 | 6000-6050 |
TACHOMETER ALLOWABLE VARIATION - 626 MODELS
| RPM Indicated | Allowable RPM Range |
|---|---|
| 1000 | 1000-1050 |
| 2000 | 2000-2100 |
| 3000 | 3000-3150 |
| 4000 | 4000-4200 |
| 5000 | 5000-5250 |
| 6000 | 6000-6300 |