I'm not going obd 2. That would definitely be way more work than it is worth. Just swapping in an obd 2 vss because the housing is smaller. The vss works the same whether it is obd 1 or obd 2. Still looking for a helms manual for the 91 dx hatchback. More than likely I will have to wait for payday before I get it. Got my chassis adapter for the harness. It looks like it will be an interesting time installing it.