I have installed the lastest level VRO on my 1990 Johnson and it comes with an Extra wire for Sysetm Check... So Why not install System Check I think... Rubic Cube was easier.. after installing the System Check Tach and figuring out all the Connections (no new harness or Connector for Tach) I have everything done except I can't get the horn to go off for the 1/2 second when Key on..Does anyone know if they came up with a new style alarm horn when system check came out... When I turn the key on My Metal alarm horn give a click that you can feel but not hear.. almost like there is resistance on the wire to ground. <br />The way I think it works is the System Check module Grounds the horn for a 1/2 second to make it beep but mine doesn't beep just a low level click.. Again almost like not enough time for the old style horn to respond. Anyone have any thoughts. or ideas.