I am installing a G4 plug in into my friends mx5 mk1 supercharged and everything seems fine apart from the IAT is showing 100c (max) all the time , i am using a universal sensor from efiparts.co.uk and have entered the calibration into cal table 2 and selected for the sensor to use that table, the sensor is wired from the ecu to the iat then earthed along with the rest of the sensors back to the ecu , i am sure i have missed something could anyone shed any light ??
also i have not investigated this properly yet but when cranking the car it backfires and does not start , the ecu has  been on an mx5 in the past but it was a turbo not a supercharged .
any help much appreciated thanks