To change PSI to KPA in your csv, Open CSV file in your favorite spreadsheet software

Right click on the column with manifold pressure psi, and add a column.
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In the top row of the new column, enter
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=6.894757*AB2

AB2 is the first row with psi data, if it's in a different spot use where it's at. You can enter everything except that and click that cell and press [Enter] key also.
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Enter [ MAP ] in the top row of that column
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Now copy the cell you entered the formula in.

If you move the curser back to a cell with data, hold [Ctrl] key & press [ ↓ ] key, this will move the curser to the bottom row with data.
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move back to the empty cell

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Now hold both [Shift] key & [Ctrl] key
and press [ ↑ ] this will select all the cells we need.
Right click the highlighted cells and paste.

Spreadsheet software should compute the data in all the rest of the cells.

now save the file. Make sure to keep it .csv file. you can now use it in trimalyzer.

If it needs tuned, you should make it run speed density and tune the VE table, then possibly fine tune MAF, And if you want to keep using trimalyzer for this, you will need to add your VE table layout to it.

If you do need to tune, PCM logger may be an easier path, I don't know, never used it, I think you can use it with Universal Patcher