Umm no mods would be required for basic functionality (i.e. speed, rpm) but you can't get the compass and other special digital features of the sle or ssei cluster to work without changing a lot of stuff. Trust me I had a ssei cluster stuck in my car to test it. All gauges worked (the volts were showing as boost lol) and the tripometer worked but nothing in the red lcd screen worked.
darn, lol, that sucks... alrighty thank you for your input. As of current i have to replace the cluster due to some of the soldered bulbs burning out in some tough spots... resoldering them would be a pain. so its off to a scrap yard and find me a cluster