My Saturn gauge is reading over heating

Well I actually replaced both the fan switch and the coolant sensor and as far as where I put the coolant sensor I believe that model only has one and I replaced it I asked the auto zone guy and that model only Carries one so replaced the coolant temp sensor and the fan and btw they re both the same thing, and by that I mean they use that same component that little sensor to do both but unfortunately I haven't had the chance to change the thermostat yet because as I was driving the car the tail pipe or resonator corroded and fell off it came off from the catalytic converter from the front muffler and well my new question is this would anyone know of a place whether online or store where I can purchase a really cheap tail pipe by that I don't mean a used one but a fair price I've checked with summit and so far they're the cheapest I can find online for 69 bucks? Lol I guess it's cheaper than auto zone's 102 bucks but if there's a place where I can get one for under 50 I would greatly appreciate it?

It is a 1994 Saturn sc2 twin cam

Well there are two sensors on that engine there's one that s easy to get to and that's the fan switch below that switch if you look down at the bottom of the engine is the temperature sensor a little bit harder to get to those are the only two sensors that car has. Yea I am looking for the tail pipe resonator which is connected from the front muffler and the back muffler.