DASHTICK HELP with Temperature Scale

Having difficulty getting dashtick option to work. No matter what I try it doesn’t space the tick marks like I need.

I have a temperature bar chart that has a range option of 20 to 150 degrees.

I would like to have tick marks very 2 degrees if possible? Everything I have used from the websites puts marks every 1 degree which clutters the chart to be unreadable.

Any suggestions would be great.