Digital Display Modifier is a program that patches GPL.exe so it shows the same digital display also in cockpit view.
So, if you drive in chase view you will always see the digital display, no way to change that.
That's probably why Bob notice a drop in FPS in chase view.
If you actually have a GPL.exe that has been modified by Digital display Modifier to show the digital Display in cockpit view, then to get rid of that you need to open the program DigiDisp.exe and select Analogue Meters Only as option in Display Mode.
BTW I use DDM on a D3Dv2 raster and have no issues at all while pribluda drops the FPS and makes GPL unplayable.
I read Ginetto's comments with great interest. I also read everything in addition to this thread on GPL FPS issues that I could find. The bottom line seems to be everybody is probably right or nearly right given their gaming rig, 3D settings, and various driver packages. Changing GPU drivers can have an impact on FPS due to the way data is handled. The combination of settings used in GEM + and your GPU control panel will also impact GPL FPS. DDM and Pribluda have different impacts on Open GL and D3Dv2 ... and the list of intricate combinations goes on and on.
Just as a lark, I tried Ginetto's DDM and D3Dv2 raster combination and with a little fiddling, I got it to work better than the OpenGL v2 and the other specs that I was previously using? Go figure!
The bottom line is that I hope all of you find a combination that works for you and I am very grateful that we have so many learned contributors that support our beloved GPL game. This has been a very interesting and informative topic ... thank you one and all.