I'm just about to plumb the H25A (circa 2002 I believe) into my SV620's computer (Apr. 1995). I have a sensor at the back of the H25A block that (apparently) isn't on the H20A. It looks a bit fancy for a temperature sensor, but OTOH my old H20A has a single wire temp sensor I haven't found a match for on the H25A engine. I'm guessing the obvious, but I can't find an SV625 Service Manual to check against. The sensor's connector is beside the RHS oxygen sensor connector as shown here. The mating connector on the wiring loom is a white wire.
Any help with an SV625 Service Manual or specifically this problem would be appreciated.
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~h25single-wire-sensor.jpg