The wattage rating was very low on mine - only 2 watts @ 70 celcius. I walked away for dinner, forgot to turn it off and came back two hours later. No issues whatsoever. Now for people powering three meters, two watts may not be enough. The link that you provided is rated at more than enough watts to handle three gauges. Just place one in series with the three gauges and tap the middle lead for the positive terminal for all three gauges.
Thaison