When I start the car and let it warm up the tach is off by about 600 rpm, says it is idling at 200 rpm. The speedometer sits below the the zero at a dead stop and appears to be off by about 10 to 12 mph while driving. What could be the problem. This is my first lexus, I bought it for 2500 dollars and it has 75,000 miles. Please help.

 

doesnt sound like a original cluster..the stopper that holds the needle near the 0 might've broken off making it dip lower.

 

is there a sending unit for the tach and speedo where is it located and can I clean it or have to replace the sensor. when I got the car the speedo was accurate and one day it just dropped all the way down

 

took cluster out and fiddled with the needles and now the tach and the speedo are perfect no problems whatsoever. my brake pedal feels spongy the fluid is a little dirty and it feels like I have to push harder than normal I heard this is common with 1990 ls 400. Also there is no needle for the speedo to lean on at a stop

 

ive seen people use a those push pins or w/e u call it to put it in there.