Well here it is guys.
It has taken some time but now I have a working prototype. As you can see it is an exact replica of the original gauges.
It is back lit as per the original gauges.
The globes have been tinted green and will be dimed down to match the cluster lighting.
The internal unit used is a high quality VDO series 1 80mm Tachometer. Like this one here. http://www.coolairvw.co.uk/Item/Shop_by_Product~Electrical_Products~Gauges_-P-_Switches~VDO_Gauges/V333355/VDO_86mm_Series_1_7000RPM_Tachometer.html" onclick="window.open(this.href);return false;
The unit is all encased in a steel cup like the original clocks and mounted with a stainless steel ring.
The brass bezel has been added to keep with the original clock design and for a bit of bling.
After much deliberation I decided to go with RPM X 1000. I personally think it looks better and I didn't want it to look like another speedometer
Installation is simple. One wire goes to the negative side of the coil. Second wire goes to a switched 12V power supply. Third wire is the ground. Fourth wire goes from the bulbs to the headlight switch. Very easy to install the only real challenge is running a single wire under the bus to the coil.
The prototype will be fully tested this week.
Parts are on order and should be with in the next fortnight.
Gauges will be available to purchase around the same time.
Still calculating final costs per unit but they will be reasonably priced.
Soooooooo here it finally is. I appreciate all your feedback. Please keep in mind this is a prototype. The final product will be more refined and without any flaws or blemishes.