Instruction Manual

DIGITAL TIMING LIGHT

1. At distributor, leave vacuum line disconnected and plugged. Connect

vacuum pump to distributor.

2. Increase engine speed to RPM specified by vehicle manufacturer.

Push and buttons until moving

mark is aligned with stationary 0 degree

mark. Note advance at specified RPM.

3. Use pump to apply vacuum specified by

manufacturer.

4. Push and buttons until moving

mark is aligned with stationary 0 degree

mark. Note degrees advance with vacuum applied.

5. Subtract degrees advance without vacuum from degrees with vacuum

applied. Difference is amount of vacuum advance.

6. Remove vacuum from distributor and return engine speed to idle.

NOTES

RPM XXXX

VACUUM XXXXX

ADV. RPM XX

VACUUM XX

ADVANCE WITH VACUUM

- ADVANCE WITHOUT VACUUM

Contribution of Vacuum