Temp sender and Shift Linkage Qs.

[THE "10" SILVERADO]

1) I grabbed a new temp sender for my new engine based on my model truck. After looking at the hole for the temp sender on my new engine it is tapped for a much smaller size. Where there multiple size temp senders? If so what should I get a sender for? (like what model) (first pic).

2) I'm a little confused hooking up my shift linkage on my TH350. There is a rod that goes from the column down to the trans. On the trans there is a mechanism that moves up and down for the various gears. What position is park? At first I thought it was when it was flat (horizontal, 2nd pic) but when I hook it up that way I can't cycle through the gears. I reversed it with park in the highest position (vertical, 3rd pic) it would go in and it seems to cycle through all the gears. I hope all of that made sense. I'll attach some pictures.