[Ram50Ron]

I have a '92 Lowline trim level Power Ram50, 2.4ltr 5spd manual tranny pickup. It came with the base instrument cluster (speedo, voltmeter, fuel guage, temp.), I bought what I was told was an instrument cluster that upgraded by adding a factory tach and oil pressure guage. Its pin connector plugged right in to the factory harness. The tach and voltmeter work but the rest of gauges do not register correctly (including the Speedo that now registers lower than the actual speed you are travelling. I bought this a couple years ago and now thought maybe If I swapped out the printed circuit board off the back of the Instrument cluster it might restore correct function to everything, unfortunately what I can find so far is 1992 Mitsubishi Mighty Max 4x4 Pickups only came equiped with 3.0 ltr V/6's not the 2.4ltr L4 my Power Ram50 has. Power Ram50's came with the choice of 3.0ltrV/6 or 2.4 ltr L4. I cannot find a factory replacement Printed circuit board on Mitsubishi or Dodge sites that give you a circuit board for a 4x4 5spd manual tranny pickup equiped with a 2.4 ltr 4cyl engine only 2wd 5pd 2.4ltr equiped trucks or 3.0ltr 4x4 trucks. Any advice?