Need a informed answer to engine missfire !
 

On my 88 Blazer, the temperature gauge needle jumps all around, so I changed the sending unit twice. That didn't help, so I guess I need to get a temperature gauge itself, so since it's 28 years old, I was going to get the printed circuit layover. Does it make any sense to replace the other gauges too ? All the other gauges work fine ? :icon_imnotworthy: