well my understanding is that you need to have all obd2a(preface) or all ob2b(facelift) parts for it to be compatibale and plug in right or you need conversion harnesses and such if you have unmatching parts which is why im asking if its all from a facelift as im pretty sure you said you have a late model b16a2 so i would think you need a late model harness and late model ek4 ecu for the ek4 ecu to plug in but as ive said tho i dont know much about ecus and conversions so could be wrong.
It would have to be farhenheit if its the reading or you coolant would be boiling all over the place at 150 celsius. 150 F is about 66 celsius which is quite low, normal operating temp is about 80-90 ish IIRC. Might be using the ECT to bump up the idle still at the temp ill see if i can find any info in my manuals on what temp it stops using the ect. The thermostat controls the minimum operating temp so if you give it a bootful you will still be able to get it up to normal operating temp.
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