I know you have done this several times but after fitting your new temp sender unit did you reset the ECU ? may be worth disconnecting the battery or puling the ECU fuse for a few minutes, this will reset the ECU to factory settings. The other possibility is the timing could be slightly out, but jugging by the history of your problem I would say it’s ECU related.
Happy New Year Have a Good One (the time in the UK is 22.19 not long to go)
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