If you buy an ODBII dongle on e bay plus the torque app you can also get a read out of the temperature from the ECU. I'd second that - the app is very good (and particularly good for removing fault codes prior to MOT on a doggy motor  )
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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