Update, my gauges are now working!!!! it does not matter what harness you go with it's the gauges that's the problem. Instead of making simple like for like senders they are all different.For example the oil pressure sender is at the back of the block, my gauge package sends me a new sender with a kit to tap into the oil pressure by-pass at the filter???? You will have to go on e-bay and purchase a $10.00 part to make this work. Then the temp. sending unit (good luck) !!! you need a 3 wire to make the gauge read. 98 Firebird or Camaro , they can be found. you will need to remove the plug in the opposite head and install the 3 wire sender. ( I was told on ls-1 do not replace the 2 wire with the 3 wire which seems the logical thing to do). So I didn't. But finally the gauges are working, there is no simple plug and play.
