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Viewing Single Post From: Fitting an Outside temperature Gauge
Matt
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You can use your existing cluster Michael, but you will need to drill it. There hollow is there on every cluster, but on cars not specced with an OTG, its just covered with a black plastic strip. You basically need to drill two holes in that plastic to open up the hole. Don't worry if it doesn't look too neat as the OTG will cover all of that once fitted.

But Michael, have you taken into account your power/ignition/lighting feeds for the OTG? as you will need these.
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Fitting an Outside temperature Gauge · In Car Entertainment