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Old 05-08-2021, 12:15 AM   #2
fetchitfido
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Join Date: May 2006
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2001 SC2
Default Re: 1998 sc2 tach issues still

Tach Adapter
Red -> +12v
Black -> Ground
Red/Green -> Tach signal from PCM (white wire)
Gray -> Gauge

M2300 Tach
4cyl = both DIP's down
White -> Grey wire on radio harness (or +12v if you want the backlight on all the time)
Red -> +12v
Black -> Ground
Green -> Gray wire from adapter OR White wire from PCM if not using adapter

All +12v references are key-switched sources, not directly from the battery otherwise it'll drain the battery.
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