Garnet, the instrument I am using is an Acewell 2853. Check it out here –Garnet wrote: I need to do something with my /5's instrument and am looking for ideas.
http://s3performance.com.au/acewell-285 ... -p-60.html
There is a physical size specification image you can click. The diameter of the body is about 65mm, so I had to make up a spacer. I used some 6mm polycarbonate sheet and turned a rebate around the underside such that it would fit into as well as overlap the 85mm hole in the headlight bucket (which is a Chinese copy of a Russian copy of something like an early BMW bucket).

The bright amber light is the Alternator light - it needs to be about 3W incandescent for the alternator to function correctly.
Good things about the instrument – lots of functions: two trip meters, clock, average speed, elapsed time, max speed, etc. Very accurate, once you get the front wheel diameter correct. RPM sender runs direct from the coil, and there is a multiplier function. Since the scale runs to 12k and I rarely go beyond 6k I set the multiplier to 2.0 and made up a new scale for the face. It also has a fuel gauge (which requires an optional sender unit). I would like to turn this into a voltmeter – just need to learn a bit more.
Not so good things – the idiot lights are not bright enough for sunlight use. I’ll be fitting some brighter LEDs, probably arrayed around above the face.
The Acewell cost $250 from an Australian supplier. Google should turn up a US or Canadian supplier. I have also seen a beautiful German made instrument that suits the 85mm hole, but it is about 400 Euros. TF Much!