Nice to see someone else making gadgets and widgets to test nsx systems. With the age of the car now, the knowledge base for original test equipment, and the availability of original test equipment will be naturally falling off, so it's good to see people developing new kit. Now you have the basics sorted, can control the pulse levels at will, it's a small programming step to a showboat sweep display or automatic stepping between defined levels!!!
Oh, and note that 2 caps in the dash are bipolar electrolytics....