The instruments are more work.
There are 3 attachments for each instrument. One at 3, noon and 9 o'clock. I think they are 7/16 but might be 3/8 nuts.
When I replaced my wiring, I was able to keep the oil and temp gauges hooked up, I just moved gauge to one side and rewired.
Speedometer is easier. Remove speedo cable and a few blubs and its removeable, from back side.
Helps to have shop manual.
Good luck
