Yeah, just swap out the third member. The RWAL will work if you wire in the speedometer sensor pickup from the transmission into the little white box behind the glove box. That is the speedometer calibration unit plus it feeds pulses for the cruise control and antilocks. Use a stock oil pressure sending unit. If you had a tach you'll need a converter available from BakerElectronix.com. For water temp, drill out the passenger side head at the rear where the plug is screwed into the block and use a factory unit from your 93. The 1998 LS1 three wire unit must have the wrong resistance because my autotap and PCM don't agree with what the dash guage says so I would say go with the 93 sending unit.