Are you sure you've got the right forum?
I don't think these lines will compile and run correctly using PicBasicPro...
Code:
VAR1 = PulsIn RPMPoort , Laag  
VAR2 = PulsIn RPMPoort , Hoog  
...........
VAR1 = PulsIn KmPoort , Laag  
VAR2 = PulsIn KmPoort , Hoog  
...........
  Case (95 * V1 * Diff) To (105 * V1 * Diff)              ; gear ratios +- 5%          
      versnellingstemp[i] = 1
  Case (96 * V2 * Diff) To (104 * V2 * Diff)             
     versnellingstemp[i] = 2
  Case (97 * V3 * Diff) To (103 * V3 * Diff)              
    versnellingstemp[i] = 3
  Case (98 * V4 * Diff) To (102 * V4 * Diff)             
     versnellingstemp[i] = 4
  Case (99 * V5 * Diff) To (101 * V5 * Diff)             
    versnellingstemp[i] = 5
.............