Mac,
My temp gauge wire wiggles a little also. �I figured it would leak, but it doesn't. �I think there may be a rubber bushing, or something similar down in there. �
On the Castle bolts, mine are 5/8" from bottom to top. �Yours do not look as tall as mine. �
A taller castle bolt...or washers behind those will solve your problem.
By the way Mac, from another post you had concern about the large photos. �Mine are quite large also, but I like them big. �Shows better detail!!

Tim