SW heat gauge

P.J. · #1 05-29-2009, 05:04 AM

I am trying to get my vintage SW heat gauge to work in my chevelle.I hooked it up to the Gm heat switch and It does not work. I grounded the gauge and the needle went right to the end ,so I know that the gauge works.Does this gauge need
a special heat switch???

PJ

**John Brown** · #2 05-29-2009, 07:39 AM

It needs a S-W 362 series sender.

What size pipe thread do you need, or what is the diameter of the hole, in inches? I have some new old stock S-W 362-AJ senders that are 3/8 pipe threads, or about 5/8 or so inches in diameter for the threads.

P.J. · #3 05-29-2009, 07:49 PM

Thanks John
the dia. of the pipe thread is 830 thousands of an inch at the cylinder head head and it is 14 threads per inch.
If necessary I can step it up from 3/8 pipe to 1/2 pipe if it is the correct sending unit for the gauge.
Let me know what you want for it
Thanks
Pj

**John Brown** · #4 05-29-2009, 08:38 PM

Peter, the 1/2" variety is available from

http://www.glen-l.com/inboard-hdw/sw-gauges.html

You need part number 90-975. Don't worry about it saying 100-240 degrees, because the Deluxe gauges just leave off the number 60 down at the bottom of the gauge. I didn't know what size hole you had, but I'd rather see you get the correct sender instead of having to use an adapter. Just glad I could help out.

**SuperNovaSS** · #5 05-29-2009, 08:51 PM

I have a bunch of NOS ones. The part numbers are 362AA, 362AH, and 363E. Let me know what you need.

Jason

**SuperNovaSS** · #6 05-29-2009, 08:58 PM

**John Brown** · #7 05-29-2009, 09:03 PM

He needs a 362-AH. They're brass and brass won't weld itself to an aluminum intake.

**SuperNovaSS** · #8 05-29-2009, 09:05 PM

What is the difference between the 2? They look the same externally except one looks to have a steel body and the other is brass.

Jason

**John Brown** · #9 05-29-2009, 09:11 PM

The difference in the numbers is brass vs. steel body. The boat versions are brass, but steel welds it self to aluminum through corrosion, so I wouldn't use the steel ones for that reason. If you have a cast iron intake it wouldn't matter though.

**SuperNovaSS** · #10 05-29-2009, 09:13 PM

Thanks John, you really know your SW. P.J., if you need one let me know. If anyone else is looking for one there are plenty to go around.

Jason

Jason

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