I mentioned my SBC '32 roadster that is new to me in another thread. Here I'd like to get some advice on an elec fan thermostat.

Currently the car's fan is wired to come on with the ign switch. I also believe the car doesn't have a coolant thermostat in it. It takes a while to warm up and usually operates at about 140 degrees according to the Dolphin temp gauge. In addition to flushing the coolant and adding a thermostat, I'd like to install a thermostat for the fan so it only runs when needed.

Some of the cheaper ones I'm seeing have a probe you are supposed to "insert" into the radiator fins. The fins on the radiator are so close together, I don't see how this would work without cracking the fins.

Are there any kits you can recommend that would simply use the existing temp sensor in the manifold that goes to my temp gauge?

As a side note, let me say I appreciate the hospitable attitude that seems to be a part of this forum. Lots of forums tend to dogpile on new members that ask newbie questions. Thank you.