Re: {Chrysler 300} 1962 Oil & Temp Gauge Abnormalities

Hi Matt,

Agree with John. Sounds like you are good, especially based on your IR temp readings. May also want to confirm temp at water pump housing and at the front end of the heads. With our 62 sport 383, it’s usually in that range you got at water pump housing, sometimes a little over 190. Front corner of heads will be about 205F on ours. If you get confidence that the temp is good, maybe a voltage limiter could be installed as John mentioned, or even one of those devices that changes resistance (I assume is basically a fancy potentiometer) could be installed in line and tweaked until correct readings are achieved on gauges (photo attached). Do you have a pressure gauge to double check the oil pressure?

Respectfully

dave

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On Jul 1, 2022, at 6:50 AM, John Grady <jkg@xxxxxxxxxxxxxxxxx> wrote:

I believe nothing is wrong with gauges or senders , both sets would not go wrong in same way same time .
The gauge voltage regulator has probable failed or the ground that is needed on the metal that holds the gauges is not there or failed . It is a little jumper under the screws . Sort of poor design , as screws only go into plastic . You try a jumper from the metal frame that holds gauges to car body or tighten screws . If out of car ( a lot of work ) I solder a wire to that metal then to solid ground .
If gauge regulator has failed ( rare really) some are in the oil gauge , some are a little metal box , latter easy to change . If in oil gauge you either need a new oil gauge or slight Re wire for solid state one or retrofit one in the box .
JC may have that and instructions
You can tell if regulator is working by putting a volt meter from temp sender to ground , some few volts should be there , but it should pulse on and off about every half second . If it does it works . If steady volts it is not working . Volt magnitude does not matter .
Hope this helps .
Car will run fine with no gauges but I doubt that is issue . Both would not fail at once .
John

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On Jul 1, 2022, at 6:11 AM, 'Val Jeffers' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Sports had a 150 mph speedometer ? Am I wrong ? Just wondering.

Thanks,

Val J

On Friday, July 1, 2022 at 12:55:27 AM EDT, 'Matt Allyn' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Attached are a pair of pictures from today when driving our ’62 300 Sport.
Here’s some history….

- Wife bought the car back in 1987
- We had JC Auto restore the Astrodome back in the 90’s
- I cracked the 413 block back in the early 2000’s (sitting in LA traffic, of course)
- We then let the car sit for 8 or so years
- Now its on the road & everything under the hood is new; but as a 383 versus a 413
- The Oil & Temp gauges are running on their HIGH side since we brought the car back to life
- I have new sending units feeding both gauges (yes they are new & aftermarket, but both cannot be sending high signals; right?)

I suspect the issue is the gauges themselves.
Maybe I pull them & send them to JC Auto.
Can the car still be used if I pull those two out?

When the temp is as pegged as it is…..
My laser temp sensor pointed at the radiator, its hoses, etc. reads between 180 & 190 degrees.

Any thoughts?
Thanks!
Matt Allyn
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