You can group a bunch of parts together to create a gauge much like a puzzle. You can build puzzles in a table with no extra spacing (as I did here) or you can just pack the images beside each other. If you pack the images remember that any white space between tags (ex <tag>here<tag>) will add space in your layout so you will need to watch for that. White space within a tag is not significant so you will often see things like
<tag white_space_here_does_not_mess_things_up
><tag>
This one does not have white space between the image tags
This one does have white space between the image tags
Images used:
<table border='0' cellspacing='0' cellpadding='0'> <td width='10'> </td> <td width='150'>0</td> <td width='151' align='right'>300</td> <td width='9'> </td> </table> <table border='0' cellspacing='0' cellpadding='0'> <tr><td colspan='5'><img src='scale320.png' border='0'></td></tr> <tr><td width='10'> </td> <td><img src='bar_gray.png' border='0' width='121' height='20'></td> <td><img src='bar_black.png' border='0' width='5' height='20'></td> <td><img src='bar_gray.png' border='0' width='175' height='20'></td> <td> 123</td> <td width='9'> </td> </tr> <tr><td colspan='5'><img src='scale320.png' border='0'></td></tr> </table><br/>