Check and make sure that you didn't knock an ignitor wire on the back of the ignition coil loose or off when you were removing and installing the tank. I did that once and it drove me crazy trying figure out what was wrong.

2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.