New Guy in So-Cal

[Baggerjohn]

I just bought a 67 long bed C-10, 2wd,, 250 six with a 5 speed gear box. I do not have a speedo cable on it. How do I marry up a cable with a stock speedo gauge?
Also, the previous owner gutted the heater and A/C unit out of the truck. Is it best to try to find oe parts to install or get after market? Has anyone heard of the all electric ac, heater. defroster from Southern Air? Wonder how it works. I would appreciate any info I can get. Thanks in advance.