mdude

Ahhh, did you buy it at around the same time your avatar pic was taken...?

IXLR8

There really is no reason to keep a spare in the car if the one you have has been reworked.

I've seen 3 failed DME relays; my own and two of other Rennlisters, and all of them were in perfect condition as far as the relay components go (contacts, relay coils, etc).

What causes DME relays to fail is the sub-standard soldering of the relay board which you can redo and once done, I'll bet it'll never fail again.

The following DIY details what fails and the fix.
DME Relay - Failure & Repair

After you rework yours, keep a spare if it makes you feel good. I keep one for other Porsches on the road.