turning the dial 59 steps should be right
We will look at the bottom four pictures numbering them from 1 to 4.
First number 3 (the stone):
The Symbols on the stone are mathematical formulas in unary system. (only counting ones)
Each vertical line $|$ is a one and for each single number you simply count the vertical lines.
Each two horizontal lines $=$ is an addition symbol.
Each square $\square$ is a multiplication symbol.
Each T-like symbol $T$ is an equality symbol.
Therefore we get the following equations:
Next is number 4 (the plate):
This is a mathematical term.
First we have to calculate the corners with the respective mathematical operators.
Corners 1 and 4 (counted left to right, top to bottom) are products of something.
Corners 2 and 3 are sums of something.
Next we go one step to the middle.
Corners 1 and 2 are added to get the top half.
Corners 3 and 4 are multiplied to get the bottom half.
Finally the top and bottom half are added.
We get the following term.
But where do we get the numbers to put into this term.
In picture number 1 (the hill) we can see stones that have numbers in the same unary system as in picture 3 written on them.
We can also see a pedestal. The same pedestal as on the plate in picture 4.
In picture 4 however the pedestal is on the right side of the plate so we have to imagine the stones in picture 1 rotated by 180$^\circ$ as if standing on the other side.
With this we can see the needed corners.
Corner 1 is 5 and 6
Corner 2 is 7 and 8
Corner 3 is 3 and 4
Corner 4 is 1 and 2
Lets fill in the term.
Therefore I think that the dial has to be turned 59 steps.
As for the symbol in picture 2 I think it is a red herring and has nothing to do with the dial since i was not able to think of anything it could be used for.