I actually bought a new gage from Alcor. I didn't want to replace the probes and wiring, which seemed to be working fine even though they were the older original things. But Alcor makes a replacement gage - the only catch is that it is more expensive. I think it cost $150 or so (going by memory - this was about 3 years ago), but that beat replacing the other things in my opinion , especially when we're talking rear engine.
An additional downside is that the earlier model probes cost more when you do need to replace one; if you get a newer gage and wiring, etc. and go to the trouble of replacing things, when a newer version of the probe is needed it is cheaper.
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