One thing y9ou need to know -
you must install the switch panel fully before trying the wiper switch. The housing serves as a ground and the switch will not work unless installed 100%. I just re-discovered this myself this week. I refaced my guages and went to reinstall the switches and thought I had something crossed up when I went to test the wiper switch w/o it installed in the housing all the way. After trying several switches, I gave up, put the swithes and housing back into the dash, and figured what the heck, tried the switch one last time before heading to bed - Low and Behold they worked!