i have a 91 firebird with a 3.1 v6 and i found a good deal on a 305 tpi because the lt1 i was supposed to buy had blown both head gaskets, anyway if i buy the 92 tpi would the guages and pretty much everything plug and play? or would i still need to wire a lot?

You'll need a 91-91 tpi engine harness at the least.