So I had just purchased a 93 ls400 with 188,000 miles. The only two major problems I'm having are that my tachometer and temperature gauge work but are off where they need to be, like my temperature gauge works but the needle is below the C on the gauge. Same with my rpm gauge, when the car is at an idle it moves slightly to indicate its idling but is below 0 on the rpm gauge. When the car is getting warm the needle will move, but not the accurate area of where it's supposed to be. I am also getting code #55 indicating knock sensor #2 failing, is there a quick guide or any help on how to replace this? If anyone has any tips or guides on how to fix these issues please inform me. Thank you.
