How can I change the orentation of prograde as it relates to my rover

[Error 403]

So I built a rover that has rocket engines on the back inline with the length of the rover. Switching from prograde to retrograde always points these engines in the desired direction and works fine but on the bottom of my rover I put to small engines so that when I am ready to land I cut the 2 engines at the back and pitch forward 90 degrees and switch to the 2 bottom engines so I can land on all 4 wheels with the rover being perpendicular to the surface.

Is there a way to make the rover switch the prograde reference 90 degrees in line with the bottom 2 engines?

[Poppa Wheelie]

Here are three methods you can try.  I've used all of these.  I currently use the last one (with the K2-D2 mod), but the first two methods work fine with no mods.

With no mods:

• Put a control point that faces "up" when your current control point is facing "forward" and your engines are facing "backward"
  • Control point can be a probe core, a docking port, a command pod, or a "Grumble" seat (oriented the right way)
• When you are ready to switch from "engines facing planet" to "wheels facing planet":
  • Cut throttle
  • Do "control from here" from your new control point, and orient SAS Retrograde
• You can set this switch of control points to happen with an Action Group

Or this method, with no mods:

• When you are ready to switch from "engines facing planet" to "wheels facing planet":
  • Cut throttle
  • Switch SAS from Retrograde to Stability Assist
  • Pitch nose forward to bring the wheels facing down
• Let the rover land from this position

One more method, with the K2-D2 mod:

• Before you begin your regular descent, open K2-D2, select Attitude Pilot, and set the following:
  • Set Elevation to zero degrees
  • Set Heading to whichever direction your rover nose will be facing when it lands wheels down
  • Do NOT press the K2-D2 Attitude Pilot Start button yet
• Do your regular landing, engines facing planet
• When you are ready to switch from "engines facing planet" to "wheels facing planet":
  • Cut throttle
  • Press the K2-D2 Attitude Pilot Start button