I use the RPM data logger on my last 8 cars,
Charlie Stewart has also use them on his many cars, and installs them on almost every new cars he builds for customers
Randy is a great guy, and will help you understand the data. The RPM is also very affordable, and with 6 egt’s rail pressure , fuel pressure , pre intercooler , and post intercooler , nitrous pressure , engine , and drive line rpm, boost , drive pressure , along with the Pro software . it’s around $2000
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