Hello guys.
First thank @realdashdev for help
I try a small project for my car . With only obd - elm327
Cause I was a digital cluster for my car this is a good cheap and quick version 
Be careful we can’t take off the original cluster for smart will not start.( if y want to do this I don’t know how haha )
Mine project is easy and cheap
Need real dash app (free)
An obd adapter ( I use elm327 )(ali expres 4-5 euro)
A smartphone or a tablet ( find an old one )
Charge cable+ data (3-4 euro)
And a smarphone holder
I paid for virtual cockpit at real dash.(6,99)
At that cluster work all except fuel level
Try to find a way.( cause for that data need k-line adapter)
Be careful need put vehicle parameters .
For smart I make mine and works .
For gear parameters
Gear
Choose ( i ) garage
Click at door at car
Click at gear
And put that calibrate gears
Gear 1 50.776
Gear 2 15.088
Gear 3 6.871
Gear 4 5.551
Gear 5 3.904
Gear 6 0.000
For fuel ( current and average)is take it alone , just put parameters of your car
**Choose garage **
**Tap at hood of car **
Engine parameters
Engine type → inline 3
Engine size → 600cc
Max rpm-> 7000
Rpm warning → 6000
Rpm critical ->6000
Idle below rpm → 900
Injector size ->121
Go back
Tap at wheels front and back
Tired and wheels
Tire width ->175
Tire aspect ->14.0
Wheel diameter ->14.0
Pressure ->2.1
Odometer
Find the settings I will search again
At begin guage
For change max speed guage
Click edit
At search wrote speed gauge
And choose ->Speed gauge range high
Click down right contex
→ input & values
Change max → 140
Critical level → 100
Then → done
For change max rpm gauge
At begin guage
Click edit
At search wrote rpm
Choose small rpm gauge
Done right corner choose context
Then input and values
At value range set 7000
At warning level 6000
At critical level 6000
Then done
For mine potition of odometer put that settings
Mine I mean I change place of total odometer , current and average value at gauge )
Odometer ( show total km of car)
X= 628
Y= 253
W= 264
H = 30
Odo unit ( show the letters km)
X=845
Y=180
W=39
H = 3040
For current fuel consumption value
X 442
Y 530
W 106
H 35
For current fuel consumption unit( show l/100)
X 555
Y 541
W 70
H 22
For current text
X 537
Y 570
W 70
H 25
For average fuel consumption value
X 920
Y 530
W 106
H 35
For average fuel consumption unit
X 1040
Y 541
W 70
H 22
For average text
X 1010
Y 565
W 70
H 25
The final until now
