Huey detail pictures will be a good addition. They've been in short supply. Thanks.
I've been working on some updated single pointer instruments which might be of use in your project. They're based on DIY air-core movements and on Switech stepping motor automotive gauge movements. The air-core movements are good for very small diameter gauges, down to a 1". The Switech movements will fit into 2" and up gauges, are limited to about 300 degrees of rotation, but you don't have to make them. They're available through Ebay for $4~7 each depending on quantity. I've designed a prototype circuit board for driving them.