Temp gauge not working Chevy C15

[TCLARK]

Hi Bob
Nope the window won't open and no roof hatch, probably built
on April fools day!
There has never been a hole in dash center for the vac line,
but I can soon make one. Tomorrow I'm going to have a good look to
see where that line originally went. Maybe it had no optional wipers too ha ha.
I did rebuild the wiper motors and they purr along nicely. I used fluid film
instead of petroleum based lube, so the seals shouldn't deterierate too badly.

Sure hope I can get an original speedo cable!
Cheers
Terry