is it possible to connect a fuel sending unit from an auxillary tank that is rated as american standard at 32-240 ohms (something like that) to the in dash fuel guage in my 1980 300 td and hav it still work for both tanks, but switch over whenever i flip the auxillary tank switch? ( sorry for th run-on sentence)
thanks for any help
Will

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'73 VW camper
'80 300td wagon

Your second sender needs to have the same ohm range as your primary sender and gauge. Aftermarket VDO gauges all use 10-180 ohms, but I'm not sure if OEM VDO applications use the same range. Easy to check with a meter and a stock sender. As far as switching goes, you need a 3 pole on/on switch that is available from www.waytekwire.com or similar places. The center post goes to the gauge, and the 2 outer posts go to the 2 senders.

Good luck.

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J.B. Hebert

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Current Vehicles:
'76 Ford Bronco
'78 Volvo 262C Bertone V8
'80 Alpina B7 Turbo Coupe (For Sale)
'94 Ford Explorer
'95 Mercedes E300D Sportline+

If you are using a Pollock motorised valve, it has contacts for switching the fuel tank senders built into the valve, and this valve is available in a 6 port, (2 change over valves) which allows both the fuel delivery and fuel return to be switched.
I have mine on order, to complete my WVO conversion.

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Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.