Here's a few:

 http://cgi.ebay.com/ebaymotors/liquid-FILLED-Fuel-pressure-gauge-gauges-PSI-Mechanical_W0QQcmdZViewItemQQcategoryZ6763QQihZ009QQitemZ190207745830QQrdZ1QQsspagenameZWDVW

http://cgi.ebay.com/2-Liquid-Filled-Pressure-Gauges-2-1-2-x-1-4-CBM-0-60_W0QQitemZ270221126840QQihZ017QQcategoryZ56992QQssPageNameZWDVWQQrdZ1QQcmdZViewItem#ebayphotohosting

http://cgi.ebay.com/2-Liquid-Filled-Pressure-Gauges-2-1-2-x-1-4-CBM-0-60_W0QQitemZ350038381230QQihZ022QQcategoryZ56992QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 http://cgi.ebay.com/POOL-and-SPA-FILTER-PRESSURE-GAUGE-back-mount-0-60-1-4_W0QQitemZ200208736352QQihZ010QQcategoryZ116412QQssPageNameZWDVWQQrdZ1QQcmdZViewItem