I was curious what the neutral safety switch in the transmission does, how to change it, where to buy one, and most importantly what modifications may need to be done after I switch from older morse dual shifters to gaffrig shifters?

You wont have to do a thing instead of hooking the safty switch up thats built in to the shifter the switch is already hooked up in the transmission

Ok, thats good to hear, having one on the new shifters I got and having one on the trans was confusing me, thanks for the help,