I got it working! Yes, it's a Y-splitter called a DMS-59
First of all, I found out that I needed to use "TwinView"
But my Nvidia driver "nv" was not compatible with TwinView.
So I downloaded the driver that is compatible, "nvidia" driver.
I downloaded it and proceeded to install it. Keep in mind that you have to be in init 3 runlevel. To do this you can edit the /etc/inittab and change runlevel 5 to runlevel 3 and then reboot.
It will boot into command line.
change directory to where driver is located and execute:
It will load and possibly ask you a couple of questions, I answered yes to all.
before rebooting I made the following changes using vi on "/etc/X11/xorg.conf" - in the Device section.
I added the following below board name:
BoardName "NVIDIA GeForce FX (generic)"
Option "TwinView" "true"
Option "TwinViewOrientation" "clone"
Option "metamodes" "1280x1024,1280x1024; 1024x768,1024x768"
Option "HorizSync" "30.0 - 80.0"
Option "VertRefresh" "60.0 - 75.0"
Option "ConnectedMonitor" "CRT, CRT"
I saved changes and rebooted. And it worked. It displayed both on my monitor and the overhead projector.
I hope others can use this!