78 924 fuel gauge question
 

I am new to this forum but been around a few rabbits and early porsches. I recently bought a set of three guages from a local junk yard and was planning on putting them in my rabbit. i would assume that since they are both VDO that they read off of ohm changes, but on the rabbit there was a printed circuit board with what i believe is a voltage stabilizer/regulator? I was just wondering if there is something similar in the porsche wiring for the fuel guage or if anyone has any advice/info about putting porsche guages in to a rabbit. Thanks in advance

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