Tripod is essential. Slow shutter speed a must (many seconds). As a result, low ISO is a must, as the long exposure will increase noise.
You will work with the lights of the unit to be photographed as a source that needs to be there and you will need to compensate with additional light that will illuminate the rest of the panel - and shorten the exposure which will decrease the effect of the glow of the unit's built in lights.
A flash is a good source and then you need to experiment with duration (in thousands of a second or (small) fractions of the full blast, whatever your flash provides). As you increase the effect of the flash (multiple blasts are ok) you need to shorten the exposure.
You will need to experiment with the angle of the flash, to get the effect you want. Try out lighting from top, top left, bottom left and compare the results and decide which angle works better for you. (straight on is the worse angle for portraits but perhaps it's what you want to make a uniform image).
A diffuser for the flash is also essential, unless you are aiming the flash on the ceiling, wall or a neutral colored surface. It helps soften the light and gives more detail on the subject.
And remember, you build up experience as you try. A digital camera makes that practically free and feedback is immediate. If you have a dSLR/Mirrorless, set it up to shoot tethered on your PC/laptop so you can see images immediately on the big screen.