Electronic expert needed, Henderson gauge interface

simonfraser

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I have a working Henderson gauge, LCD display showing correct tank level.

Have now bought a VDO water tank display, matches the rest of my dashboard
https://vdo-webshop.nl/download_pdf...ns_en_viewline_52mm_fresh_water_lever_arm.pdf
Also bought a voltage to current interface, in fact i have two, in error
When connected the needle on the VDO goes to max and does not respond to adjusting the screws on the little blue boxes of of either of the interfaces
Also does not respond to changing the output of the Henderson output on the water supply pipe

Have i got the correct parts ?

What am i doing wrong ?

Tnx for your input
 
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