should i use something other then maps
There is nothing wrong with using map. The only problem is with the way that you were using it. The map() function takes 5 arguments, not 11 as you were supplying.
The first argument is the value to be mapped - the output from the analogRead function, for example.
The next two arguments define the range you want to map from - 0 to 1023 if the value to map is from analogRead.
The final two arguments define the range to map to - 100 to 145 in your example.
If the minimum value ever returned by analogRead corresponds to 2V, then the value will be around 400, and you can use that value as the lower end of the from range.
if input 1 and 2 are not == stay at pos 90
They probably will almost never be. It sounds like what you want, though, is to do nothing if the difference is less than some value, rather than the two values being equal.
I suggest that your biggest problem right now is not understanding what analogRead returns. It does not return a voltage, and the values are not 1V, 2V, etc.