Yeah its hell easy, i had never done anything like that before however have done all of my mates stereo's and mine plus other electrical bits in my car so i had a bit of know how, i put a 3inch pivot el dial one in my cxi, its on the a pillar as well. It took about an hour and my instructions were all in japanese so i had none pretty much. Yes you just have to splice your rev sensor into the blue wire on the top right hand side of the engine bay and there is a hole in the fire wall just above the pedals, i also ran my earth wire through there into the engine bay aswell. All in all i find it better, 2 of my friends have the same car and i always win because of the tacho because i know when to properly change. So it does come in handy in your slow speed drag races! i hope that all made sense