here's mine. pat turner helped me out with it.
it's just the original tomos speedo pulled out of its housing and attached to the handlebar mount with a couple of screws and modified brackets that we took off of a puch speedo, shaved to size and put holes in to fit. there are a whole bunch of washers spacing it out.
i reattached the speedo light wire and wrapped the other wires (high beam indicator wire, etc.) around themselves until they were not noticeable.
feel free to email me directly if you want to do this and have any more questions.