temperature sensor for my new gauge

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02ViperMtn

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Joined
Jan 4, 2009
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166
Age
49
Location
Kamloops, BC
I have bought an autometer gauge and aftermaket 1" hose splice adaptor for the 1/8" npt sensor. When screwed in the adaptor the sensor is not right in the flow. Do you think it will give poor reading as is by looking at the pictures? I think i will drill out the surface threads and i may get half of the sensor into the flow. Does it really matter?
 

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  • outside.jpg
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I installed an Autometer temp gauge with the same sensor. I made an adapter for putting the sensor in-line with the coolant line. I made the adapter so that approx. a 1/4" length of the sensor is in the coolant flow. Drilling out the upper threads on you adpater will not allow it to thread deeper into the adapter since both the adapter and the sensor have a 1/8" NPT pipe thread. You'll need to use a 1/8" NPT tap to cut the open up the thread dia. deeper into the adapter. Your adapter will work fine.
 
notice in the picture called 'outside' that it threads tight well before it bottoms out and the sensor is still not in the flow. If i drill the upper threads this should allow it to thread into the deeper threads?
 
No the pipe NPT threads are tapered. RX1JIM is right. You can drill some away but then you will have to run a tap to your desired depth so it will thread in more. I don't recommend it as it will weaken your thread and could cause a leak. You don't want that now.

I think it will be fine how it is. The coolant will still pass by, just not directly on it. The housing is aluminum so it will heat up very quickly with the coolant anyway.
 
02ViperMtn said:
I have bought an autometer gauge and aftermaket 1" hose splice adaptor for the 1/8" npt sensor. When screwed in the adaptor the sensor is not right in the flow. Do you think it will give poor reading as is by looking at the pictures? I think i will drill out the surface threads and i may get half of the sensor into the flow. Does it really matter?
Click to expand...


When I installed a capilary tubed type gauge in my XCR I did not get correct readings until the probe was in the coolant flow. Not sure if an electrical type probe is any different, but the capilary type needed to be in the flow.

I had to modify my adaptor (homemade version of your fancy aluminum one) so as to allow about a 1/2" of the probe exposed to flow.
 
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