![]() Lock the dizzy down and set the idle RPM back where you want it. You use ZERO because your light is flashing 11 BTDC. Rotate the dizzy until the engine's ZERO marker lines up with the pointer. Press the FLASH button and the light/strobe should start. Using our example above, you would press INC until "11" is displayed. Switch to advance mode and use the DEC or INC buttons to change the time at which the light flashes. In tach mode bring the RPM up to 1000 using the idle speed adjustment screw. Let's say you want to SET the timing to 11 BTDC at 1000 RPM. What you do need to know is how to use the feature. you don't have to know the factory specs for your engine. To use the advance feature he mentioned above. ![]() To elaborate on the above, the black clip goes to an earth point, the red clip goes to +12V (the battery terminal on the starter solenoid is such a point) and the inductive pickup clamps onto the plug wire for cylinder #1. Use the same thing to check full advance. ![]() When you use the light set properly it will read zero degrees at the set rpm IF the timing is correct. Then switch to tach and adjust it to the correct number. Now use the Tach/Adv button to select degrees. and that full advance should be something like 30 degrees at 1500 rpms. They will tell you that base timing should be something like 4 degrees at 500 rpm. Snap-on Tools Usa Computerized Tach Advance Timing Light Mt1261a W Pb48 Case 249.95 View Item Details Vintage Early Snap-on Timing Light As Is 25.00 View. To use the advance feature you need the specs for the engine. Locate Snap On Timing Light on sale below with the biggest option of Snap On Timing Light anywhere online. Now it will display the rpms of the engine and can be used as a standard timing light. It should come up and ask you to select number of cylinders. Hook up the battery leads, Clip the pickup on cylinder number one. Flash - On/Off for the strobe Dec - Decrease the setting Inc - Increases the setting Basic use. Stole this from another site (where someone asked for a manual for the same model timing light), maybe it'll help you: Reset button - resets the light to zero Tach/Adv - Toggles between the tach setting and the advance settings. This is the best I could come up with after Googling for a while: Quoting from that site.
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