Very good info, Mike. I was thinking the same thing, go with version 3, buy pigtails and tin the wire ends under the screw terminals.
But version 4 and a IDE connector from you would work too. I did find those 6 pin Amazon connector pigtails you used.
If I do this, I'll go VR pickup and signal conditioner, as the wheel is already on my crank pulley and the VR sender is there already.
I was going to use a temp sender in the head, as that more closely follows the transition from cold to warm in my engine. It takes a while to warm the oil, only a few minutes for the heads. There has to be a reason the VW engineers put the temp sender in the heads on type3.