Merc temp guage senders

[scott reierson]

I need part # or hot tip for a temp guage sender to my teleflex red international guages.

Can I splice into the hot horn sender wire and run a guage and the horn? I don't have any of these left from past projects and cannot remember exactly how I used to do this.

I'm running twin offshore bridgeports and have a temp guage for each motor and a hot horn. Any suggestions or part #'s appreciated

[motion]

Scott, get the two wire head temp sensor, and put it in the other head, one is ground strap the other tan wire for the gauge. Joe

[Liqui-Fly]

I think the hot horn sender is an on/off type of deal while the temp is variable. I believe you need the sender. Teleflex has a decent web page. I'm going to look and see if I can find a part number for the sender. By the way do you need a trim gauge...practically new (Tele Red). 10 bucks plus shipping. New motor has no sender.
David

[Liqui-Fly]

I unit in the staboard head says temp sender for my '94 2.5. It has a tan and blue wire running out. Is that for a horn only and is it on off only?

David

[Liqui-Fly]

Do you have to tap the other head to put the sensor in?

David

[motion]

I believe the heads Scott is using has the bolt hole already threaded in both heads. Good thought, I have had to drill and tap heads before to get the sensor hold down bracket to be useable.

[Liqui-Fly]

It has the threaded hole.....do I need to knock the bottom out of it? Going to ship your thru-hulls now.
David

[LakeRacer99]

What are you guys trying to do?
Are you trying to measure water temperature or head temperature?
There is a temp switch in the head, Tan/blu I think, and that goes to the overheat horn. For your Temp gauge, get a Teleflex sender, Boater's World sells them for $7.00ea. Run a seperate wire to the gauge from the sender, the ground will be the contact to the head and the gauge ground.
The temp gauge and the overheat circuit are 2 seperate circuits.

Some tips: if measuring head temp, use some heat conductive grease on the end of the sender and you get better readings. If not, the Sender is made of Brass and will eventually oxidize/corrode and your readings will go to ****.
Also, if reading water temp, don't use top of head unless probe will make contact with water. I think sometimes there are steam pockets in the top of each head.
I have a seperate gauge for each head on my 260.

Good luck,
LR99

[Liqui-Fly]

Got the tan/blue for the horn but nothing in the left bank. Have a sender from my old motor that I was going to put on the opposite side. The head has the threaded portion for the sender. So a maybe I do just want head temp because it isn't in the water path. Is a 100 to 240 gauge for head or water. What do typical instals use?
David

[scott reierson]

I know about the Teleflex #54031 sender and the "z clip" that holds it in the blind hole and reads from the bottom of the socket.

I was hoping that a merc style sender like the hot horn type was available and compatable the Ohm range that teleflex uses. I'll be using the Teleflex sender.

Thanks for all the input.

Scott

[Liqui-Fly]

What is a good conductive grease to use on the sender?
David

[LakeRacer99]

Fly:
Look at: http://www.teleflexmarine.com/pdfs/instrumentpdfs/redintern.pdf

It shows the 120-240 Deg as the I/O H20 temp gauge and the OB is Hot-cold. I use the Red Intern also on my boat, and I am using the 120-240 Deg to measure H20 Temps. I had OMC gauges on my hydrostream and was reading head temp. Which is better? beats me.

The conductive grease I was using was made by Honeywell, I was siver in color and had a "metallic" smell? Very messy stuff and If you get it on anything it is tough to get off. We used it at my work for thermal conductance of RTD and Thermocouple Temp probes that are placed in a thermal well. It makes a big difference if used, (quicker reaction of gauges).

Have fun.