Dual electric fan relay with shroud

[CSchmidt]

I have a 1967 Chevy C20 that I've been restoring and upgrading. My question is I have a temperature sending unit on the truck now with the wire going to the cluster. The relay kit came with thermastat switch. Can I tie in the wire from the new relay harness to the wire I already have there? Will the new thermastat switch still send to the temp gauge in cluster or do I need to put the old sending unit somewhere else?

Also can I tie in the new wire to the ignition switch I already have so I don't have to run wire all the way back to dash?

Sorry for the half ass questions. Also I hope my questions were not to confusing.

Let me know with any info so I don't have any set backs

Thanks for your time
Chris

P.S. pictures will be available upon request.
Posted via Mobile Device