I bought a used 2000 LS400 a couple of months ago. As soon as I drove off the used car lot, I noticed the problem with the speedometer and the tachometer. For me, sometimes they don't work when I just started the car. Most of the time, I drove for a few miles and they start to work again. I tried to see if I can detect a pattern but so far it appears to be random. Any suggestion will help. I just joined the club today.