I'll try and answer your question re: priming. On our tractor (keep in mind this was a while ago), there was a stopcock, just like on a radiator, that you opened while someone was cranking the tractor. Air bubbles would come out for a while then fuel and air, then only fuel. Stop cranking, close the stopcock, and then start the tractor. It was on the left front side of the tractor (as seen from the driver's seat) I believe. At any rate, it should be obvious if you trace the fuel line from the fuel filter bowl. Hope that helps.
Why do you need a tach/hourmeter? Is the one on the tractor broken?
Good idea to get the manual. And where's the tractor picture by the way?