Which wedge did you get ? the standard Meade field type ? did you get the LX90 adaptor plate with it. You'll need the adaptor plate to connect the two, the LX90 has just a centre bolt hole for connection. When you set up the wedge don't forget to subtract your Latitude from 90 " to get the right angle for the plate the scope attaches to.
If your going to be attaching equipment like a camera/focuser/dew shield/guidescope definitely get a counterweight system, preferbly a 2d type like this.......
http://www.admaccessories.com/produc...es/.......this means a bottom dovetail plate for the C/W's and if you have a guide scope a top dovetail plate for it and guidescope rings. You can also get a guiding module kit for the LX90 if you use ST-4 cables but you might be able to use pulse guiding via ascom through the LX90 handbox, just check up on that if you decide to get up to the guiding stage.