If you are worried about detonation, $125 will buy you a J&S Gauge and knock sensor. Should be easy to install.
Grand National guys bought a lot of these. A/F gauge is also good, but pricey for Autometer.
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more!