I'm with Art my favorite pinning rod is the K&S .020 brass rod, very thin but very strong. I also bought a variety pack of straight pins that included several different sizes (gauge). This pack will out live me and my building career. If you pre-assemble your sub assemblies and ad pin mounting you can almost dry fit the entire model before you painted a thing.
Various size styrene rod is also a good pinning choice. I cut of the short little stub that is cast into the part and add a larger and longer piece of rod. Here I have extended the pin using styrene rod.
Here I have replaced the cast in mounting pin on the shift lever.
And like Bill. I love my Touch-n-Flow applicator and liquid cement. I don't use for temporary assembly like Bill but I find it it is a fantastic tool for permanent work.