Making a XML gauge

Hi all. I am in the process of removing all my hair at too early an age. I have created the bitmaps for a RADIO HEIGHT gauge and I am having trouble getting the code to work. First I am a newbie at all this gauge stuff so please be kind as bald and bruises do not look good together. First let me include the code I have as of yet.
(A:RADIO HEIGHT, degrees)
The gauge is appearing on the panel how and where I want it. The issue I am having is getting the height needle to represent the correct height. Sitting on the tarmac (433') the gauge reads 85 feet. As I apply collective the needle rotates until it indicates 5000'. The aircraft at this point is only 293' off the ground. What am I doing wrong? Any help would be appreciated.
The gauge is appearing on the panel how and where I want it. The issue I am having is getting the height needle to represent the correct height. Sitting on the tarmac (433') the gauge reads 85 feet. As I apply collective the needle rotates until it indicates 5000'. The aircraft at this point is only 293' off the ground. What am I doing wrong? Any help would be appreciated.