Been along time since I did this but will see how I go.
If you have all the necessary wiring on the S dash then it should be a breeze.
Look for the large factory plug on the back of the original dash and cut that off.
As the S dash runs individual guages it will be easy to just check the wiring on these and match the colour codes to the original plug.
If you cut the original plug off leave enuff wiring if you need to re attach the original dash plus you can even put the original plug back on the dash and trace on the back of the printed circuit board to know what colour wiring goes to what.
As to the Tacho if you post the wiring colours coming out of this I will be able to tell you where that needs to be hooked up as the standard Ronas never had this option.
And no there isn't a wiring diagram for a 1600S Rona.
You will also need to change the oil sender switch also.
Cheers Brett.
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