Street Fire PN 5520 and MSD Blaster Coil?

Fisher said

Use a vacuum gauge. Or if you have a timing lite with a tach in it i have an OTC lite that i use .

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Thanks, I have a vacuum gage, but I think the cam in the motor might not give me accurate readings. I used the tach in the car this morning, just some back and forth foot work. I think I got it pretty close. Thanks again, I will look up that OTC lite....