Call JIM9783354096 for tech support and core info. This is a professionally rebuilt Corvette dash cluster. If your TACH is haywire and/or your LCD faded this is what you need. The LCD has been repolarized to negative image and the TACH has been repaired/calibrated (stock image available too). All NEW bulbs installed and fully tested. Note that the miles are stored in your BCM not the cluster.  A $150 core charge will be invoiced separately upon purchase/contact. The $150 core charge will be refunded upon receipt of an acceptable core. The core must have a LCD which is not fractured for full core credit as the LCD is not available. The core unit must be from a 1990 or 1991 corvette. This cluster will NOT work in 92-96 corvettes. This is a plug and play unit.  A return shipping label is provided FREE to ship back the core unit. It is fully tested and warrantied for 1 year.