Actron Advance Timing Light CP7528 - Manual (Page 21)

ADVANCE 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.
3. Use pump to apply vacuum specified by manufacturer.
4. Press and hold down button. Turn
advance knob until moving mark is aligned
with stationary “0” degree mark. Note
advance at specified RPM.
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
20