I am no expert but I would say that 0w20 is too thin. Not being an expert I couldn’t tell you what you should use but i wouldn’t go much thinner than a 5w-30 oil personally

As for the problem you are experiencing I don’t have an answer, however if you want to share the video you can upload it to YouTube and then share the link to the YouTube video.

OOPS!
I have made a silly mistake.
Today while I was working on my car I noticed that my gauge does in fact go from cold to hot as it warms up.
still have a small problem as it still went up past the middle mark-albeit much slower than with the old sending unit. I used my thermometer and it showed that the engine was infact warmer than it should have been. I believe that the new sending unit from Dennis Carpenter is working as a viable replacement. I just want to verify by taking a temperature reading when my needle is in the middle and comparing it to someone else who has a known good system.

Can someone tell me what temperature their engine stays at after it warms up at idle and where your needle sits at that temperature (I have a 1948 327)
once I verify that this new sending unit works as a replacement I will feel confident adding it to the Parts Cross-Reference.

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This is unfortunate to learn as my car has this, however it is broken and not something I had looked into yet.

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Email sent, awaiting reply.

UPDATE
I have received the new sending unit from Dennis-Carpenter. The threads matched up perfectly and it physically fits, only now instead of the reading going from cold to all the way hot. it starts at cold and goes past that to even colder as the engine warms up. Is there some wire that I need to change around to get this unit to function as the original once did?
Could this possibly be caused by a short? I would'nt think so, however my wiring is very old and crumbly.

I tend to feel more pain buying all of the small pieces. the larger parts for our cars I have found are relatively fair price.

That is good to know, thanks. I will go ahead and order one of those sending units. I did just a quick measurement of the treads on mine and they show .64" the part sold by Dennis-Carpenter says it is a 3/8 NPT threading so I think it should work.
I will let y'all know my findings once the part is installed.

The reason I believe it is the sending unit is because the gauge reads as if the car is overheating once it gets warmed up, however a thermometer says otherwise. If this is an obvious sign that I need the gauge fixed please let me know.

Hello, can anyone tell me what the correct ohm readings would be for a coolant temperature sending unit on my 1948, 327? I want to make sure that it is the sending unit that is my problem before I buy a new one. I tried searching the site to no avail.

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HAHA that is a good question for a PM.