Re: 273 V8

[Bob <64ragtop@xxxxxxxxxxxxx>]

Gary, and all...

I'm confused by looking at the specs for that sender.  Over the years, 
Ma MOPAR used temp GAUGES in some cars and temp LIGHTS in others.
The sender for a light would be a switch which would close at a certain 
temp, grounding the sender lead and turning the "TEMP" light on.
The sender for a gauge would be a variable resistor that would change 
value with a change in engine temperature, like the sender for a fuel
gauge changes resistance with the level of fuel in the tank, causing the 
gauge to change its reading with the change in fuel in the tank.  Using a
switch-type temp sender in a car that has a temp gauge would cause the 
gauge to read low until the switch closed, then read high after that,
with no reading between.   I would bet that buying a temp sender at a 
generic auto parts store would be an crap shoot.  In fact, I think I made
that mistake at least once in years gone by.

The specs for that sender look to me to be for a light, not a gauge.  
But, of course and as always, I might be wrong.  the part of the specs that
confuses me is: "Temperature Rating: Closed at 100 Deg. F 129 Ohms w/ 5% 
Tolerance..."  That looks to me like it would cause the temp light
to come on at at 100 degrees.  I do not understand the purpose of that 
resistance in the circuit.

I hope my analysis of the switch versus variable resistor sender is 
clear and if anyone can explain the specs on that sender I would 
appreciate it.

BC


On 6/9/2014 8:50 AM, Gary H. wrote:
> If you ground the gauge sender line does the needle move to the H end of the gauge? Does the fuel gauge work?
>
> I'm remembering that, unlike mechanical, a lot of electric aftermarket temp gauges, e.g., Autometer, use senders that screw in the stock location without any mods needed.
>
> http://www.rockauto.com/catalog/moreinfo.php?pk=40481&cc=1329465 seem right specs?
>
> Thanks,
> Gary H.
>
>
> >   -------Original Message-------
> >   
> >   Hi –
> >   
> >   
> >   I need some advice.  I have had trouble with the temp gauge
> >   on my 65 273.  Even when fully hot, the needle barely moves.  I have
> >   replaced the sending unit, gauge itself and the wiring from the gauge to
> >   the bulkhead connector without any improvement.  I will continue to work on
> >   this issue this summer as time permits but I have a more immediate problem.
> >   I have a trip coming up shortly and I don’t want to be without some
> >   type of temp gauge.  I looked into a basic mechanical Sunpro gauge that I
> >   could hang on the bottom of the dash but the capillary tube that fits into
> >   the block as well as the fitting itself are substantially larger than the
> >   opening for the sending unit.  So, I have the following questions –
> >   
> >   
> >   1)      Can anyone suggest an alternative way for me to hook up at least
> >   some type of temp gauge or light?
> >   
> >   2)      I will contact Sunpro or another supplier to see if they have
> >   something I can use but I need to know the specs for the sending unit
> >   opening.  It appears to be 7/16 x 28.  Can anyone confirm this?
> >   
> >   
> >   Thanks, Bob from Maine

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