Gauges Go Out on 2000 Mitsubishi Mirage

[dsoel]

I have a 2000 Mirage 1.8 L where when it is hot (Above 90 degrees) the Tach, Speedometer, Odometer, Water Temperature and Fuel Gauges stop working. All the turn signal indicators, idiot lights and shifter indicator lights work normally. The gauges come back on after the interior of the car cools down by using the air conditioner. But lately, the same instrument cluster devices stop working shortly after the lights are turned on for night driving.
I've verified there is voltage to the fuse, the fuse is good. I've removed the instrument cluster and did not see any cracks on the instrument panels traces. I've reflowed the solder joints and ohmed out the traces and they ohm out good. I verified the return/ground path is good with a meter. I adjusted the contacts on the instrument cluster connectors. I have a Chilton Repairt Manual but the electrical diagrams don't show the instrument panel.
Does anyone have a good electrical wire diagram of this area of the car or know if the tach, speedometer, etc is connected directly to the instrument package or are they going though another devide? Or do I need to just replace the whole cluster?

[chyld]

wow.
if it were me, i would see about replacing the whole cluster. if that doesnt work, maybe the ecu.
but first i would take it to a automotive electrician before getting new parts.