I have a question about an MSD "Soft Touch" rev control. I bought one used and it has two plug -in chips in the rear, one is for max rpm (7000) and the other is for No. of Cylinders. Question is how do you tell which cylinder chip it has ( there are no markings on it)? Randy

1957 Dodge truck, Snakeskin Green with a little stroker motor. 1964 Plymouth Savoy wagon ( my new project)