With zero compression the one thing that jumps out at me is did you adjust the valves correctly. It is free to check so maybe do this first. Loosen the valve adjusters on the low cylinders by quite a bit then re check for that matter loosen them all. if the results go up then they were too tight. I have been bit by this before. If the valves never close you will get no compression. Also Harbor Freight guages are crap I have one here that did not last through the first test , crapped out after 2 cylinders. Also you can get a bit of heat in the engine by plugging the block heater in for at least an hour , it won't be hot but it will be warm. Cheers Dan

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