Wire to fuel tank sender in 1994 Mitsubishi lancer glx snapped how do you get at it?

i presume you mean under the back seat. there are 2 little handles one under the left back seat and the other under the right back seat pull both of these and the seat should be free, you can just pull it off as it is entirely foam and shouldn't be attached to the top half of the seat. once this is off pry off the metal plate in the middle (sort of looks like an ashtray) and underneath should be the fuel tank sender. You can use an ohmmeter to test it: when full it should read 2-3 ohms, when nearly empty should read 115-120 ohms.