Also get thread chasers, you don't want to keep running cutting taps & dies through existing threads as this can shave down material to the point that the threads get weak. This is especially true if you're chasing critical things like the head bolt and holes in the engine block. They get cut once and chased thereafter.
I bought a Craftsman thread restorer kit that handles most of the common metric and Imperial chasers. I bought most of the rest as well as taps & dies from AAA Metric piece meal as I needed them.
'91 Pickup - Imelda
'08 Tacoma TRD - Donna