The intake temp gauge is in the MAF and if it was on the fritz you would get a MAF code. The ambient temp gauge should be somewhere along the front bumper, usually on the drivers side of the front bumper. It should simply pop out after you unplug it.

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1997 Mercedes E320 Turbo
Garrett T3/60-1 Turbocharger
Custom Water Intercooler Setup
352rwhp/366rwtq @ 8.6psi in '08

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