Marcel, thanks for the nice compliment. You helped make it possible with your excellent job of restoring the gauges. 

It is a great honor for me to be part of your awesome project, Mark!

I am offering this original early Sandcast tacho meter. This tacho meter does not contain any reproduction part, except the wire loom (Yamiya).
The tacho meter received a professional service (refilled damper), and looks and works as new.

Price: 650 euros + shipping (+VAT if applicable)

http://www.cb750faces.com/cb750faces.nl/en/honda-cb750-k0-sandcast/71-honda-cb750-k0-tacho-meter.html

Hi Marcel,
Nice job on the bike. Well done
Is that an electric car in the last photo?

Thank you!

That is an electric BMW i3, indeed. The opposite of the K0, but I love both!

My VIN is 104008**

Is your K0 originally from Holland/Germany? I thought that these turn lights are delivered in Holland and Germany only

The Dutch type-approval authority, RDW, approved this bike without any remark, for a Dutch title. The people there loved this bike, too! When a bike comes from outside the EU, the test is much more than just a paper work examination. All technical parts were tested. They test it according the rules from the date of first use, in this case 1970.
I am now waiting for the paper work in order to make a license plate. I will get a vintage title. In 1970, the bikes had a blue license plate.

Marcel, great to hear on vinegar and wonderful pictures.  I've heard a number of good reports on vinegar on the AMCA and CAIMAG discussion boards. 

your pictures of the results are very appreciated.

also heard molasses works well.  never tried vinegar or molasses.  but SEEING your experience will get me to try vinegar.

i have been using a product called "Metal Rescue," not an acid product, which works very well but is $25/gallon.  Vinegar is inexpensive !!

after using rust remover, i put 50 8mm bolts in my tanks, rotate then in clothes dryer for 50 minutes and beautiful raw steel is exposed.

Great report and pics using fiber optic scope ?

I paid .52 euros per liter, so that's cheap indeed.
I recommend to cover the outside of the tank (if it'has a good paint) with plastic. Vinegar can damage the paint.

I have removed the rust with vinegar.
First, I cleaned the tank with water based degreaser and nuts, moved it for a few minutes.
Second, I filled the tank full with vinegar for 24 hrs.
Third, I cleaned the tank again with water based degreaser and nuts, moved it for a few minutes.

The result is perfect.

Time to play outdoors!