Hi Tim,
The Pm manual for creating an aircraft type file says:
TrimMin=6
TrimMax=16
TrimScaleMin=40
TrimScaleMax=40
Min/Max values for trim value (for takeoff) and maximum/minimum value of trim scale.
My type file (ERJ 145 LR.txt) has this entry for trim scaling:
TrimMin=6
TrimMax=16
TrimScaleMax=5 ;Not real world numbers - set to these values for proper
display.
TrimScaleMin=5 ;Not real world numbers - set to these values for proper
display.
These values show more realistic trim values in PMRJ EICAS (for the ERJ 145) - its a question of playing with the values until the display shows OK.
You can also check with FSUIPC calibration, depending on what device you are using to set trim - pot, or switch.
Hope this helps - as usual, a little trial and error is needed.