He means a heat gun, not a temp gauge. That way he can use it to heat up the engine.
You could also try wraping the cooling head with foil or something to help keep the engine temp up.

My engines using Ron's break in method for the B5, never got above 110 without heating them up first. I would heat them up to as hot as a hairdryer would get(about 160) and it would be back to around 110 within 30 seconds. I've never been able to do the heat cycling method, just becasue I haven't bought an engine warmer yet, and I don't have a heat gun. If you don't have any way to get the engine warm enough, you might want to try out Ron's break in method. It's really easy, and has worked for me on the engines I have tried it with. It's on the first page of the werks B5 thread.