temperature sending switch question

[Denee007]

Hi~!
If I were to EVER find a temperature sending switch for my sbc 350, will it work with the factory temp gauge on my original dash? or is there an ohm difference?

Also, I bought an electric fan for the radiator from Classictrucks, but it didn't come with a harness for switching it on and off; they don't offer. On my intake manifold towards the back and drivers side, there's another plug~ can I put the switch for the fan there? or does it have to be near the thermostat? and any suggestions for the switch/wiring/etc~ where to buy or what kind?

I'm getting very close to cranking this engine up! just the piddling things (like wiring) are very irritating! lol
dne'

This is an earlier picture, I'm a lot further than this pic