I got Autometer Cobalt gauges too. I got the boost gauge from Autobarn and ordered the EGT gauge off an ebay shop (think it was Engine Master Aust. ???). If I had of ordered the boost gauge from the same eBay store would have saved a little over $50 and the EGT was over $100 cheaper than Autobarn.
One tip is get an electronic boost gauge. I got the mechanical boost gauge and it had a slight vibration/rattle, swapped it over and same thing. Apparently you get that with some boost gauges in diesels. But overall happy with the gauges.