its not a map sensor. its a Manifold differential pressure sensor or MDP
its only there for monitoring EGR function.
If your car has obd2 then you have an mdp. If you don't have an MDP, then your car is not obd2
So you are getting a 7g?
very first mod has to be prothane master bushing kit. hands down.
then springs and shocks. Everything else, even power adders.... can wait.
Side note, i'd spend the money bringing that 7g up to par before you start modding it.
These cars are getting old. I can assure you that no matter how cherry of a 7g you come across its going to need some work, whether its obvious or not.