Why is my factory tachometer so far off?
Thread Starter
Senior Member
Joined: Feb 2000
Posts: 968
Likes: 0
From: Lafayette, LA
Car: 1972 Corvette
Why is my factory tachometer so far off?
At 1000 rpm my tach reads 2000 rpm.
At 2000 rpm it reads 3800.
At 3000 it is around 6000.
At 6000 it is about two inches past the bottom of the tach.
WTF?
How do I fix this?
Comparisons were made based on readings on my scan tool Vs. the tach.
------------------
'91 Z28 Blue/Silver ZZ4/ZF6
335.9 RWHP 374.9 RWTQ
At 2000 rpm it reads 3800.
At 3000 it is around 6000.
At 6000 it is about two inches past the bottom of the tach.
WTF?
How do I fix this?
Comparisons were made based on readings on my scan tool Vs. the tach.
------------------
'91 Z28 Blue/Silver ZZ4/ZF6
335.9 RWHP 374.9 RWTQ
Supreme Member
Joined: Jul 1999
Posts: 1,335
Likes: 2
From: Tucson, AZ, USA
Car: '92 Z28; Dk Teal; Her Pkg
Engine: 305
Transmission: Richmond 6 Spd
Axle/Gears: Moser 9", Detroit Locker, 3.70
The tach filter (if equipped) is mounted to the fire wall, behind the distributor. Your '91 probably does not have a tach filter.
Tim
Tim
Thread
Thread Starter
Forum
Replies
Last Post
