Stock Tach is not reading correct RPM - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

herbieS13 · 12-13-2010, 01:46 PM

I have a s13 sr swap w/ power fc d-jetro, the stock tach and the RPM reading off the pfc commander is off by as much as 1000rpm in higher RPMs idle - roughly 2000rpm stock tach and pfc readings match but anything past that the readings off the commander are roughly 500 rpm higher until 5000-5500 then it climbs to as much as 1000 higher than the stock tach, is there any fix to this? Or should I start shopping for a new tach?

edit:::
i have an s13, 89'

Steve Lloyd · 12-14-2010, 06:18 AM

you need a dual cam tach, the SR in an '89 won't read properly. The tach is easily swapped so you can retain your odometer if you care, or else just get a dual cam cluster and swap it in.

herbieS13 · 12-14-2010, 04:00 PM

awesome thx

12-13-2010, 01:46 PM	#1
herbieS13 Zilvia Junkie Join Date: Nov 2008 Location: FT Campbell, KY. Posts: 329 Trader Rating: (2) Feedback Score: 2 reviews	Stock Tach is not reading correct RPM I have a s13 sr swap w/ power fc d-jetro, the stock tach and the RPM reading off the pfc commander is off by as much as 1000rpm in higher RPMs idle - roughly 2000rpm stock tach and pfc readings match but anything past that the readings off the commander are roughly 500 rpm higher until 5000-5500 then it climbs to as much as 1000 higher than the stock tach, is there any fix to this? Or should I start shopping for a new tach? edit::: i have an s13, 89' Last edited by herbieS13; 12-13-2010 at 04:19 PM..

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12-14-2010, 06:18 AM	#2
Steve Lloyd Zilvia Member Join Date: Dec 2005 Location: florida Posts: 182 Trader Rating: (0) Feedback Score: 0 reviews	you need a dual cam tach, the SR in an '89 won't read properly. The tach is easily swapped so you can retain your odometer if you care, or else just get a dual cam cluster and swap it in.

12-14-2010, 04:00 PM	#3
herbieS13 Zilvia Junkie Join Date: Nov 2008 Location: FT Campbell, KY. Posts: 329 Trader Rating: (2) Feedback Score: 2 reviews	awesome thx