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5/8"-18 UNF Female (adapts directly to sealing nut on AutoMeter Mechanical Temp Gauges) to 3/8" NPT Male
Feature Points
  • Constructed from solid brass
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In my 70 jeep with the Buick v6 the manifold port is 5/16 which will not be large enough for the temp probe to enter. Is there an adapter to to increase the size to 3/8 and allow for the probe to fit

Asked by: Redrum Jeeper
It would be recommended to use the radiator hose fitting adapter kit. It comes in different sizes.
Answered by: Paul G.
Date published: 2024-01-10

Hello, I need to drill and tap a hole for this adapter (Part #2263) to screw into. What size tap and drill size will I need? Thank you in advance for your reply.

Asked by: Roll-1
37/64" Drill 3/8" NPT Tap
Answered by: Jim from AutoMeter
Date published: 2023-05-22

I have a Toyota temp sending unit m16 1.5 and need adapter to go to 3/8 npt

Asked by: DONALD D
M16 female in and 3/8 npt out, maybe I didn't word it properly
Answered by: DONALD D
Date published: 2019-08-01

5/8 by18unf is that m16 1.5

Asked by: DONALD D Thank you for your inquiry. The 2263 is not 3/8" NPT. See the 2275 linked above for a M16X1.5 adapter.
Answered by: Jim from AutoMeter
Date published: 2019-08-01

Is Product # 2263 the adaptor I need to put my Autometer Comp mech water temp gauge in my small block 350.????

Asked by: tooloud
Thank you for your question. We do not have vehicle specific installation information. This fitting will adapt our mechanical water temp gauge to a 3/8" NPT threaded hole. If you have a port on your application that 3/8" NPT, this is certainly the correct adapter for you.
Answered by: Zach from AutoMeter
Date published: 2019-06-25

I have an after market temperature gauge with a 5/16: diameter sensor.What s the hole size in this adapter?

Asked by: pops jim
I can't remember exactly, but the fitting itself is 3/8 so the sensor I believe is 5/16.
Answered by: Sgt1022
Date published: 2019-06-17

I have a 1jz gte will this fit in the water neck? I have the mechanical water temp guage but need an adapter to fit inti the engine.

Asked by: Mason
Hi Mason, we have no specific information on your 1jz gte, but if it's similar in size to this 3-3/8" NPT, it's more likely an M16 x 1.5 thread, which was very common on Toyota models. The M16 x 1.5 adapter for our mechanical gauge would be model 2275.
Answered by: Matt from AutoMeter
Date published: 2018-08-07

Does this fitting fit in an Ls head 5.3 241 head's

Asked by: Kevo
Hi Kevo, thank you so much for contacting us. The port on an LS cylinder head is an M12 x 1.5 thread. You can use this adapter to install an electronic gauge: An air core gauge (short sweep electronic) will also require the 2259 shallow depth sending unit: There is no way to use a mechanical temperature gauge with the existing port on an LS derived cylinder head without expanding the port. You'd have to use a radiator hose adapter for a mechanical temp gauge: Hope this helps!
Answered by: Joseph Mills
Date published: 2018-03-07
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