Identify a temperature sender

[drum]

I am refurbing a motor trawler yacht from 1978 fitted with two lehman 120 engines
Temperature sender on right below the coolant reservoir is not working ( high resistance - guage works fine if connected to other engine)
I cannot identify the sender as it has no part number
Writing on it just says AC (possibly AO??) made in usa 12v and a number 10 on the black top section
18 ntp
Tapered

Can anyone help identify the senderr or advise a solution to fit a more modern sensor

Thankyou

 

[Comodave]

Call the expert on Lehmans, Brian at American Diesel. He will be able to fix you up. 804-435-3107

 

[CharlieO.]

I ordered my replacement from American Diesel.
I've often emailed Brian questions about my Lehman and always get a response back, often time with pictures so he is sure that I understand his explanations.

 

[Carpello]

Here's the part number if you have dual stations. These were part numbers from SeaStar which I think is now Sierra Marine. Anyway, this should give you a start on your search.

1/8” TS26641

¼” TS26651

3/8” 18-5897

½” 18-5898