Technical gas sending unit info

I have an old chevy that the previous owner put a ford gas tank into , just figured that out, kept ordering sending units and getting incorrect ones.

my question is i ordered a 6 volt sender , the car is 6 volt, but the chevy sender is 33 ohms and the replacement for the ford tank sender is 35 ohms , does this pose any type of a safety issue?
as in will the variable resister glow and ignite the fuel ? or will it simply not read correctly?

thanks for any input .

Steve.

 

No safety issue.

 

Thank you, Steve , Any other input is appreciated.

 

chevy used the same sender for 6 and 12v, it was 0 ohms empty, 30 ohms full. In the late 60s they changed to 90 ohms.

Make sure the resistance changes the right direction...I know that later Ford senders are low resistance full, and high resistance empty, which is backwards from Chevy

 

The sending unit is NOT voltage sensitive but the dash fuel gauge is...

 

Ford used 6 volt gauges well into the 80's to drop from 12 volts to 6 volts they used a gauge regulator like this:http://www.ebay.com/itm/360928515943?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT So if you have converted to 12 volts and your Ford sending units did not work this is why.