is this item plug and play for a 02 usdm wrx? besides the outside air temperature option. Thanks in advance.
nope, the harnesses are different, so you'll have to find which wire is which and splice into the harness.
Is there any year usdm sti cluster that is plug and play and also how hard is it to rewire and is there a write up anywhere for it??
no. there is no usdm sti cluster that is pnp for your car. the version 7 jdm sti cluster is the only sti cluster that is pnp for bugeyes.