Tachometer Calibration Test

NOTE: DO NOT reverse polarity when installing tachometer. Damage to diode and transistor may result.

Connect a calibrated, reliable tach-dwell meter to vehicle ignition system. Run engine at varying RPM. If comparison between tach-dwell meter and vehicle tachometer readings do not fall in the standard range of permissible variation, replace vehicle tachometer. For allowable variation, see TACHOMETER ALLOWABLE VARIATION .

TACHOMETER ALLOWABLE VARIATION (COLT, COLT 200, SUMMIT)

RPM

⁽¹⁾ RPM Type 1 Tach

⁽²⁾ RPM Type 2 Tach

700

600-800

3000

2850-3150

2900-3225

5000

4750-5250

4900-5325

⁽¹⁾	Type 1 tachometer has 8000 RPM scale.

⁽²⁾	Type 2 tachometer has 9000 RPM scale.

TACHOMETER ALLOWABLE VARIATION (COLT VISTA, RAM-50)

Engine RPM	Tachometer RPM Range
1000	900-1100
3000	2850-3150
5000	4750-5250
6000	5700-6300