RPM gauge

Dori_FC09

MLD=Majorleage Doorkicker
Driver
ok so i just picked up an s13 and im trying to fix the rpm gauge and some other eletrical problemes... ill start with the rpm gauge... does anyone know where to start to check it out? what do i check?

All so my dash lights dont work the way they should... Half of them light up ( the miles per hour) and the other half doesn't light up ( rpm side). One day when i was taking it to get wash they all went on but as soon as i hit a bump the went all off... i found a wire on the radio harness the made it light up half ass again ( the way it was from the start) as soon as i ground it, but i want it to light up all the way... if anyone has anything please let me know.
 
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