[DeTomaso] VDO water temp sender

[Julian Kift]

Mikael,

Electrics are not my strong suit, but this VDO sender is a 250F/120C, so alignment depends where your full scale gauge reading is e.g. most will peg just beyond the upper scale, but hopefully you are not ever going to experience that! Looking at the VDO website it appears 120C is the lowest upper temperature point sensor they make, so likely the closest you will get without resorting to exotic solutions.

Do you know the full scale deflection resistance of the gauge? If you really want to get serious and have access to a cheap potentiometer and ohmmeter you can measure that and either find the correct range sender or use an in line resistors/potentiometer.

Julian

From: mikael_hass at mail.tele.dk
To: detomaso at poca.com
Date: Sun, 3 Aug 2014 13:22:42 +0200
Subject: [DeTomaso] VDO water temp sender

Longchamp: This winter I'll rework the engine, get new transmission, and
rework rear end. Has started already. Some small parts need replacing while
engine is out.
 
 
 
I need a new temp sender to fit in the front of the Cleveland block, 3/8"
NPT I believe. Summit suggests this, has the VDO name in the description:
 
http://www.summitracing.com/dom/parts/vdo-323421/overview/
 
 
 
Does that mean I'll get correct reading on my 1978 30-70-110 C VDO gauge?
With the previous sender I think it showed too little, good cruising showed
at or just below 70 C. Might there be a resistor in the wiring I should
remove?
 
 
 
Mvh/Regards
 
Mikael
 
 
 

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-------------- next part --------------
   Mikael,
   Electrics are not my strong suit, but this VDO sender is a 250F/120C,
   so alignment depends where your full scale gauge reading is e.g. most
   will peg just beyond the upper scale, but hopefully you are not ever
   going to experience that! Looking at the VDO website it appears 120C is
   the lowest upper temperature point sensor they make, so likely the
   closest you will get without resorting to exotic solutions.
   Do you know the full scale deflection resistance of the gauge? If you
   really want to get serious and have access to a cheap potentiometer and
   ohmmeter you can measure that and either find the correct range sender
   or use an in line resistors/potentiometer.
   Julian
   From: mikael_hass at mail.tele.dk
   To: detomaso at poca.com
   Date: Sun, 3 Aug 2014 13:22:42 +0200
   Subject: [DeTomaso] VDO water temp sender
Longchamp: This winter I'll rework the engine, get new transmission, and
rework rear end. Has started already. Some small parts need replacing while
engine is out.



I need a new temp sender to fit in the front of the Cleveland block, 3/8"
NPT I believe. Summit suggests this, has the VDO name in the description:

[1]http://www.summitracing.com/dom/parts/vdo-323421/overview/



Does that mean I'll get correct reading on my 1978 30-70-110 C VDO gauge?
With the previous sender I think it showed too little, good cruising showed
at or just below 70 C. Might there be a resistor in the wiring I should
remove?



Mvh/Regards

Mikael




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References

   1. http://www.summitracing.com/dom/parts/vdo-323421/overview/