Ohms or resistance for fuel gauge

Does anyone know the ohms or resistance for the fuel gauge sending unit....for

VDO manufactured gauges (VW, Porsche, BMW, etc) use a range of 10-180 ohms. I'd assume that Chinese & Brizilian manufactured replacements for VDO's use the same.

U.S. car makers and most after market manufacturere in the U.S. use a 240-33 ohm range.

might be the ground wire that connects to tank, it is supposed to have a copper washer under it vs. the nylon ones on the rest.

Not a hi-jack, but a related drift . . .

Anyone know what the OMS might be for a Veglia fuel gauge? I have one from a mid 70's Fiat that I want to use with a VW VDO sender and fuel tank.

Think that they might be compatible?

Brian, are you sure it's 10 to 180 ohms, my guage seemed to work at 10 to 160 ohms. 160 being full. The best I could get off my float/sending unit was 10 to 76 ohms, so I'll be getting a new one tomorrow.

Dave; According to anything I've ever read from VDO, it's 10-180. That was the range on all the VDOs I used on my Healey clone.

What's the exact procedure for finds the ohms reading on a fuel gauge? What needs to be connected to what and where?

I don't know how and would really like to ! !

Thanks !

TC

VDO tube senders are 90 - 0 ohm
http://www.egauges.com/vdo_send.asp?Sender=VDO_Adjustable



TC;
You can measure the SENDER OHMS with a simple VOM.
Here they're FREE ! Need the coupon from AAA magazine , or maybe Car&Driver
http://www.harborfreight.com/7-function-digital-multimeter-90899.html


To measure the GAUGE you would need a sender or a variable resist source (sophistimacated doohicky)


Easy as testing voltage ; set to the OHM scale , measure across terminals and read at full and empty