front passenger side hub replacement and other problems

[silkk]

this is for a 89 240 coupe.

when i'm driving it, the front passenger side hub starts rattling like it's moving around. how much would it cost to replace it and is it hard to do it myself?

the rpm and mph cluster doesn't work, but all the other gauges are working. could it be the wiring?

the engine light is always on but someone said its because i took off the negative cord on the battery and when i put it back on, it resets the ecu so i have to drive it for a while to turn it off.

[navysnail]

the hub may be bad, it sounds like excessive castor to me.

the light being on, disconecting the battery ground would make that go off if anything. pull the ecu and check for codes, some will come up. do a search on checking the ecu for codes if you dont know how.