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Old 05-28-2017, 06:40 PM
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Default Temp Gauge

So I have a 1995 70HP with the fast start feature, it has 2 wires coming off the motor I would like to know how to hook up a temperature gauge. And what is the proper running temp.

Last edited by mrelmo; 05-28-2017 at 07:45 PM.
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Old 05-29-2017, 10:41 AM
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When you buy a temp gauge then also buy the temp sender to match gauge and bolt sender to engine block then it will read properly.
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Old 05-29-2017, 12:48 PM
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where does the sender bolt on and what should the temp be
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Old 05-30-2017, 07:05 AM
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Most of them bolt under a head bolt or a water jacket cover bolt.
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Old 05-30-2017, 08:21 AM
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This is the standard "L" bracket that the bra$$ sensor screws into. The other end of the "L" bracket is normally attached to the head with one of the water jacket bolts. NOTE: Leave a .010 gap between the sensor and the head surface to avoid a false reading.


Last edited by Joe Reeves; 05-30-2017 at 02:08 PM.
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Old 05-30-2017, 12:25 PM
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OK so the sensor does not need to make contact with the water that is flowing through water jacket right, originally I thought that the water needed to flow over the sensor. So it looks like the sensor is picking the temp of the engine block or head not the actual water temp. I really do not want to remove a head bolt and I have seen a "blind threaded hole" near a head bolt, but as you said I would need to make sure the sensor does not bottom out and make contact with the metal casting, also what is the temp that the motor should be running at
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Old 05-30-2017, 02:16 PM
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Quote:
Originally Posted by mrelmo View Post
what is the temp that the motor should be running at
No idea, however the thermostat opens at about 143 degrees so it would be slightly higher than that... about 150 or so.

And yes, the heat sensors are very touchy, registering actual air heat. Some engines have a actual screw in cavity on the head for the sensor, however I retired in 1991 and you'll need to get advice on that area from someone else. Try the fellow friends on the forum at MarineEngine.com .
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Old 07-09-2017, 09:20 PM
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hi , enclosed is a photo of a 97 225 evinrude thermostat cover. to the left of the 7:00 o'clock thermostat cover bolt, is a threaded slot, i was told you screw a sensor for the temp gage. as for the wiring sorry i dont have that yet,
jet
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File Type: jpg IMG_20150531_142948.jpg (95.8 KB, 14 views)
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Old 07-18-2017, 05:35 PM
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Thanks for the photo any idea what the thread is because the sensors that I have seen have been 10mm. I would be surprised that it would be a metric thread
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Old 07-23-2017, 08:37 PM
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i would think the thread size are the same for the 97 evinrude 225 the threads are 1/4-18. i attached a photo of the sender used on a sierra lido temp gage.
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