Thanks Walter. The S-10 speedo is unique, all right. I've decided it was a little busy, but I haven't given up on the idea entirely. I've been thinking of adding a vacuum gauge in the center of the other (left hand side) gauges with the background plate the same beige color so it wasn't obtrusive. That gauge in my opinion is more important than a tach for the 235 especially in a pickup. Several years ago (80s actually) a friend made one that would illuminate a green led for good, a yellow led for ok and a red ok for not good. I meant to get his circuit, but never did. The nice thing about it was you saw the leds in peripheral vision so you weren't constantly peering at the gauge.
I couldn't tell exactly from the video. Does your adaptation use a stepper motor?
