I broke down and ordered an escort ZR3 + X50 & am now faced with the question of how/where to install it...I've no idea where any access points are on the firewall or how to route the rear module wire to the main unit. I'd rather do it myself & rank my wrenching ability a little above average (replacing the valve cover gaskets & radiator wasn't too hard) but if it's overly involved it wouldn't wound my pride to hire the work out...that being said, any and all suggestions are more than welcome

2000 540i/6