If you were to fit the ST220 dials directly in you would find you speedo would be out as the ST220 goes round to 270mph on the clock, though there maybe a way around this (doubt it though).
One option you do have is replace the dial faces white something like a Lockwoods white dial kit, these are designed as a straight replacement for the original dials.
One option you do have is replace the dial faces white something like a Lockwoods white dial kit, these are designed as a straight replacement for the original dials.