"Buy a new one" - No.
90% of the time some or all of the LCD being out or intermittent is dry solder joints on the pcb.
If you are able to solder and have a small tipped iron, you can re solder the 16 or so connections to the LCD panel.
Removing the instruments is easy (disconnect battery, remove 4 screws holding bezel, remove 4 more that hold instruments in, carefully disconnect the 2 multi plugs. Take instruments to kitchen table, carefully remove the white back panel..)
I did mine, which had some digits missing when cold, but got better when warmed up.
Tim..