Gauges quit working...they work when they want to

You have to take the speedo apart and re solder the circuit board get it apart and flip it over to the solder and on the right hand side of board you see approx 20 solder dots in a grouping with pins sticking out get a good quality solder iron and heat each pin up until the solder just changes color let cool and reassemble i had the same problem and did this and it has worked since

I have the same car... And mine was doing the same theng.. and a buddy of mine he had one and his did the same thing...It is the connections... they go bad just need to be replaced and should solve the problem it did for both of us