Sending Units

4

46vette

Junior Member
I have a question,for anyone,who have used the original gauges,with volt reducers,that allow you to use the 12volt system. Also,if you had a problem with the sending units,for the Ford,or Chevy V8? Would appreciate any help, in your experiences. No opinions please,just your experience,Thanks. I forgot I am dealing with a 46Ford.
 

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I am using the Runtz reducers on a 41 pickup that was converted to 12V. One Runtz is required per meter @ $18.00 each. These were in the truck when I bought it. You can also use an LM7806 three pin regulator and do the wiring and soldering. The LM7806 runs about $6.00 each. The stock Ford gauges use a heated bimetallic strip to move the pointer on all the meters except the ammeter. You should see about 60 ohms across the two meter terminals if the heater is not burnt out. when that checked out I used 3 C cells(4.5V) in series across the meter terminals to make sure the pointer moved. On the sensor side. The two terminal unit installed in the left head is a switch that will open when the temp approaches 212°. The single terminal is the temp sensor. It is not resistive. It operates on the principle of pulsed current. The hotter the engine the shorter the contacts stay closed. This unit also uses an elctrically heated bimetallic. The temp meter unpowered position is Hot. I have since found that the gas gauge will work with a resistive sender. 85ohms = empty and 10ohms = Full. I'm thinking the temp and OP meters will also work with these values. The sender would have to be somewhere near 10ohms at cold or 50PSIand about 85ohms at hot or 0PSI. The voltage reducer still needs to be used.
I hope this helps and good luck.
 
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I am running 12volts on an other wise stock 39 pickup. I use the voltage drop and the original gauges work. I have an original ford fuel sending unit, it was working but has since quit. I think there is a problem with the sender not the voltage drop, however.
 
I'm using the Runtz voltage reducers and stock sending units with stock gauges. No problems encountered after 5 years.
 
41ford1: Please post a photo or contact info as to who sells the resistive gas tank sending unit you mentioned below. Thanks.
I have since found that the gas gauge will work with a resistive sender. 85ohms = empty and 10ohms = Full.
 
Thanks,41ford1, really good info. I will pass this info,to my friend who is doing my project, have a great weekend. I appreciate all the comments on their experiences.
 
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