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  Oil Pressure Switch and Water Temperature Sensor: 1/8" Pipe Thread?

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Oil Pressure Switch and Water Temperature Sensor: 1/8" Pipe Thread? by imacflier
Started on: 07-09-2015 10:01 AM
Replies: 8 (224 views)
Last post by: Lou6t4gto on 07-12-2015 06:55 PM
imacflier
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Report this Post07-09-2015 10:01 AM Click Here to See the Profile for imacflierClick Here to Email imacflierSend a Private Message to imacflierEdit/Delete MessageReply w/QuoteDirect Link to This Post
I am investigating replacing a couple of meters with digital meters. I have the option of receiving new sensors with various threads. Is the stock thread for the Oil Pressure Switch and the Water Temperature Sensor 1/8" Pipe Thread or 1/4" Pipe Thread or some metric pipe thread? I have not been able to find anything definitive in the FSM and probably would not recognize the difference if I had the sensors side by side.

Anybody know what thread I should ask for?

TIA,
Larry
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fierofool
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Report this Post07-09-2015 04:04 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
The oil pressure switch is 1/4-18 NPTF . The coolant temperature sensors for the ECM and gauge are larger. Probably 3/8.
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imacflier
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Report this Post07-09-2015 06:17 PM Click Here to See the Profile for imacflierClick Here to Email imacflierSend a Private Message to imacflierEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thank you, sir, muchly appreciated.

Larry
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imacflier
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Report this Post07-11-2015 12:33 PM Click Here to See the Profile for imacflierClick Here to Email imacflierSend a Private Message to imacflierEdit/Delete MessageReply w/QuoteDirect Link to This Post
Hi, guys,

If you are looking at aftermarket gauges and need to know the correct thread for the sensor, I just got back from Autozone and screwed adapters onto the Oil Pressure Switch and the Coolant Temperature Sender (not the one that goes to the computer, the one that goes to the gauges).

Oil Pressure Switch: 1/4" NPT

Coolant Temp Sender: 3/8" NPT
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Lou6t4gto
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Report this Post07-12-2015 03:44 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
so, to drill and tap the end of a 3800 intake for a Mechanical water gauge, the tap is 3/8"NPT , right ? thanks
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imacflier
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Report this Post07-12-2015 04:15 PM Click Here to See the Profile for imacflierClick Here to Email imacflierSend a Private Message to imacflierEdit/Delete MessageReply w/QuoteDirect Link to This Post
Yes. IF you are using the Fiero sender....other senders may have other thread sizes.

Larry
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fierofool
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Report this Post07-12-2015 04:30 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
Lou, I think you might find mechanical gauges with different threads. If you're considering doing this on a 3800 intake, I would procure my gauge first and determine the thread size before drilling and tapping. The 3/8 is the size of the stock Fiero sending unit for the in-dash gauge.
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fierofool
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Report this Post07-12-2015 04:31 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post

fierofool

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Member since Jan 2002
 
quote
Originally posted by fierofool:

Lou, I think you might find mechanical gauges with different threads. If you're considering doing this on a 3800 intake, I would procure my gauge first and determine the thread size before drilling and tapping. The 3/8 is the size of the stock Fiero sending unit for the in-dash gauge.


Edit: For some reason, I didn't see Larry's last comment. Double post on my part, I guess.

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Lou6t4gto
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Report this Post07-12-2015 06:55 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
yea, the aftermarket gauges (Mechanical) have a pretty large fitting, Bushing looks to be about 3/4" that the sender nut actually screws into.
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