Yes, I used Van?s wiring harnesses on my completed RV14-A, all the harnesses are built by Stein for Van's. Very good quality harnesses that will save you time if you are not in the wiring business. Installs in the RV14 in 4-5 hours if it is your first time.
Call Stein to get the version you need for your avionics. I built mine with all Garmin G3x-Touch experimental products to avoid software integration problems now and in the future. The new Garmin 507 autopilot and the CAN bus system wiring make installation and configuration of a G3x system fairly easy. Both Stein and Approach Fast Stack build Garmin G3x harnesses that are very cost effective for a non-avionics pro.
If you want an IFR GPS, the Garmin GTN 625 & GDU 460 combo with GTX 45R (transponder, traffic and WX) is a bargain when including wiring harnesses.