temperature sender help

[WayneinNZ]

In my 68 camaro is a Classic Industries U17 console guage kit that works fine.
I have changed my manifold and now dont have a 1/2" NPT threaded hole for the sender but I do have a 3/8" hole.
I do have 1/2" holes in the heads but dont want to use them.
I have been in touch with Classic and they cant tell me the specs on the sender or the guage.
I want to find a 3/8" NPT sender to suit the guage that will go in the 3/8" hole.
Would anyone here know:
,,, if the repro guage has the same impedence as the original?
,,, if so what is ithe impedence?
... if there is a 3/8 sender that will do the job?
,,, or have any clever ideas on how to figure out the value of sender I need?

Thanks in advance

Wayne

[JohnKY]

Would it be easier to drill out the 3/8" hole, and re-tap it to 1/2" NPT?

[WayneinNZ]

Hi John,

No there isnt alot of material in that location as it is a raised area on the manifold.
I will have to put them in the heads.
Thanks for your input though.

Cheers