Wow..... more detail please
Well, Not much for tails. Pretty simple actually.
From my local junkyard, I got a valve cover from a Ford, a cam shaft from a Nissan, a cam drive gear from another Nissan and a rotor from the junk pile. Cleaned all the parts with a degreaser. Painted the rotor and valve cover.
I welded a bolt to one end of a camshaft, welded the cam gear to the rotor from below. Grounded the other end of the camshaft so that it fits snug in the oil fill hole of the valve cover. I put the welded bolt end of the cam shaft through the gear and rotor and put a washer and nut.
Attached a candelabra base to the underside of the valve cover using one of the three bolts on top. Wired the lamp through the rotor using one of the lug bolt holes for the toggle switch. Put on a cheap breather filter on the valve cover. Glued on the oil fill cap.
Put on few coats of clear coat on everything. That's all. Hope it makes sense.