Just a brief history: my nephew and I share this log in and we've gotten some great information and we appreciate all you guys for your input. Here's my question; I have a 90 crx si that I just recently purchased. It has msd sport compact ignition. It's got the box, blaster coil, cap wires but, my tach bounces around sometimes it's dead flat sometimes it's up and down it's all over the place. Has anyone else experienced this before or have any input on how I can fix this? I hate not having my tach working.