I only have the speedo and tach. From a practical standpoint, that is all that is needed, because the smaller gauges don't need to be read as precisely. Also, since you are only reversing the white on black OEM gauges to black on white, it still looks good.
Might not be as good if other colors such as blue, red or yellow were used, although the fuel and temp gauges are small, and from the pictures I've seen, are still OK.
Installation is very tricky but not really difficult or time consuming. There are several old threads dealing with the installation. You need to read those, since Erik's (Mototek) instructions don't quite cover all you need to know.
One of the key items not covered is the need to hold the needle against the pin when doing the R&R. Otherwise you may not have it zeroed when you complete the job. Happened to several guys.