Looking for temperature sender

[Spidersloveboat]

I need a sender for the temp gauge pictured. It's from a 1972 E-27. Needs a positive temperature coefficient sender, 12V supply. Resistance should be about 90 ohms at 180 F, and 120 ohms at 200 F. The photos show the only identifying marks I could find: "I", "U" and "JAPAN" stamped on the back, plus the marking on the OD. Gauge works with various resistors connected. Seems a waste to have to buy a new gauge and matching sender. But all the modern senders I have found so far decrease their resistance with increasing temperature.

 

[goldenstate]

I need a sender for the temp gauge pictured. It's from a 1972 E-27. Needs a positive temperature coefficient sender, 12V supply. Resistance should be about 90 ohms at 180 F, and 120 ohms at 200 F. The photos show the only identifying marks I could find: "I", "U" and "JAPAN" stamped on the back, plus the marking on the OD. Gauge works with various resistors connected. Seems a waste to have to buy a new gauge and matching sender. But all the modern senders I have found so far decrease their resistance with increasing temperature.

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Typical approach would be to identify the engine off of which this was removed, then look up the part number and find one on the internet or from the local distributor of parts for that engine.

The same year of boat might have a different engine. Is yours a Universal diesel or perhaps an Atomic 4 gas engine?

 

[paul culver]

How did you wire up the positive, negative and resistor for your tests?

 

[Spidersloveboat]

Typical approach would be to identify the engine off of which this was removed, then look up the part number and find one on the internet or from the local distributor of parts for that engine.

The same year of boat might have a different engine. Is yours a Universal diesel or perhaps an Atomic 4 gas engine?

It's an Atomic 4. Moyer has gauges and matching senders, but the senders are for their gauges.

 

[Spidersloveboat]

How did you wire up the positive, negative and resistor for your tests?

+12V to 'I'. Resistance in series with 'U' terminal to ground (-).

 

[Spidersloveboat]

Here's the sender, if that helps.

 

[paul culver]

I assume normal gauge operation is full right deflection when power is off, then full left when engine started then right movement as engine warms. This was the case in many older cars. Perhaps a car restoration website might have info on finding that "reverse" sensor.

 

[Spidersloveboat]

I assume normal gauge operation is full right deflection when power is off, then full left when engine started then right movement as engine warms. This was the case in many older cars. Perhaps a car restoration website might have info on finding that "reverse" sensor.

Could be.

 

[Kenneth K]

Here's a write up on my temp sender replacement:

https://ericsonyachts.org/ie/threads/temp-sender-testing.17643/

Matching old equipment can be time consuming and difficult. You could probably get a new Faria guage and sender for < $40.

 

[Spidersloveboat]

Here's a write up on my temp sender replacement:

https://ericsonyachts.org/ie/threads/temp-sender-testing.17643/

Matching old equipment can be time consuming and difficult. You could probably get a new Faria guage and sender for < $40.

Yeah, I thought it was worth asking in case there was an easy answer. But I have now ordered a new gauge and sender.

 

[paul culver]

Just curious -- how hard was it to remove the sender?
I'm about to do that myself.

 

[Spidersloveboat]

Just curious -- how hard was it to remove the sender?
I'm about to do that myself.

Was not a problem. Wasn't rusted in place. Had Teflon tape on it. I know that's not recommended by some gauge makers, but the boat came to me that way and it had been working for several years.