Wiper switch and temp gauge

[Rich_65GMC]

Good day.
First time on here, so bare with me....
I have just picked up a 65 GMC c1000 with a 307 small block conversion and have been battling some really awful wiring. The rest of the truck is good but the dash is a nightmare. Previous owners have literally nailed in some horrid aftermarket gauges and it looks terrible. I plan to reinstate the original temperature gauge but am unsure what the sender / sensor needs to be to work with the stock gauge.
Secondly the wiper switch is broken and a toggle switch has been stuck under the dash, the original is still there but with bits missing but luckily the chrome nob is still there I have searched online for a replacement but can't seem to find the right one? Any ideas would be mega.
And finally I would like to get hold of a period steering wheel but again can't find one. Any clues as to where I maybe able to pick one up. Ideally mail order as I'm in the UK.

Best regards

Rich.