Hi Dave!
Yes, thatīs the thing I suggested and it is big too. My experimental DME-relay lie on the floor behind driver seat
so itīs not a big problem to mount them.
A zener diode is by far less voluminous but has to be connected in series to a resistor (not big either) and would fit within the DME relay. However, I feel a bit on black ice now because I donīt know how great a voltage/current this zener and resistor will take when contacts open. Could not find any information of fuel pump in the Porsche workshop manual (current consumption, inductance etc) to be able to make some calculations here. However again, stores of electronic parts sell so called RC-net encapsulated in epoxy and with two legs. It is a capacitor in series with a resistor and could be choosen for a great variety of values and usually are quite cheap and small in volume too . They are in fact used for minimising voltage spikes and arcing in electrical applications
But again, Iīm not sure to pick the right one yet.
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Lapponia 1984 944 na