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Ah! Not such an easy nut to crack then?
The large metal mounting plate seems to imply some sort of heat sink, and so would in turn imply a disadvantage to enclosing the device.
You have the right idea to contact the supplier for the definitive answer to what kind of interference we are up against. They could well have a solution to the shielding regime too.
For what it's worth, I think it is less likely for the problem to come from RFI, as I think most of the sensors in question will work on electrical resistance and be fairly bombproof. Unless of course there is a microprocessor in there, in which case it could be vulnerable.
Thinking about magnetic fields; you have a Hall effect sensor inputting there, which works on a fluctuating weak magnetic field. If it is the case that coils also generate fields (which could pulse alternately?), then these fields will all have a relationship with engine RPM and therein would lay an interference problem.
All conjecture of course! It will be interesting to hear what the manufacturer has to say.
Out of interest, has anyone ever held a compass near a running coil. Or moved a compass around a switched on coil?
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