Technical Water Temp Sending Unit ID

Can anybody ID this water temp sending unit? Has a stud and nut for an eye terminal.
Goes to Classic Instruments Quad temp gauge like this. PO installed in my 40.

Surely it can’t be proprietary. Got a brand and part number? I would like to buy local.
Is it just a standard GM/SBC piece? It looks like a Standard TS-388, but I don’t know ohms.
The old one was on the blown up flathead (wrong thread size) and it’s gone away.

Speedy Bill has them for $31.45 plus shipping. That seems f’ing crazy! Maybe not.

Thanks!

 

The $ 20.00 senders I buy from the local parts house usually start leaking after a month. I would spend the bucks and get classic instruments. Jmo.
If you need it send me a pm and I will measure the ohms on mine.. I have the oil and temp from classic.

 

Thanks! You may be right about the quality issues.
BTTT

 

Maybe have a look through the Stewart-Warner temp senders here?: https://www.stewartwarner.com/product-category/senders/?index=1

Might be tough without knowing the resistance range of the gauges, but I bet that info could be found online.

 

Classic instruments #
SN25 for 1/2" pipe thread
SN24 for 3/8" pipe thread

I'd suggest buying the Classic Instuments sender recommended for your gauge.
I don't know how to get a correct/accurate cross reference to Standard Motor Products.

 

Thanks!
Checking the CI SN-25 online and on that auction site, it looks Iike it’s pretty much the same price everywhere. Better safe than sorry, I guess.