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#1
06-21-2020, 08:00 PM
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Tach reading 1970LS6
Pretty sure my factory tach is reading high. 1970 LS6, M22, 4:10 rear end. 4th gear at 50mph tach is reading about 3100rpm, thinking that’s about 800rpm or more on the high side. Factory sized tires as well. Anyone seen this before, and if so what’s involved in making it accurate?
Thanks all Marty
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1970 LS6 Chevelle 1998 Viper GTS 
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#2
06-23-2020, 07:06 AM
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If I’m not mistaken the mph would be 60 @ 3,000 rpms with a 4.10.Does your transmission have the correct speedometer gear & has the speed be verified to be correct? I was thinking 3,000 @ 50 would be either a 4.56 or 4.88..
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#4
06-24-2020, 10:52 PM
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I just had my cluster from a 70 restored,my taçh was reading high (way high)
Per John at redline clock and gauge restoration there is a material (can't remember what it was)that breaks down over time and causes the tach to read high This is what was wrong with my tach I would suggest giving him a call Good luck
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#5
07-05-2020, 08:59 PM
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So I bought an Autometer tach and hooked it up today, reads 3200 rpm at 60mph, so the factory tach is way off. Another project for another day!
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1970 LS6 Chevelle 1998 Viper GTS
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#6
07-08-2020, 05:25 PM
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Tach reading...
With a factory F70/14 tire...you would be at 2621 rpm...at 50 with the 4.10 in high gear.
-wilma
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02 Berger 380hp #95 Lots of L78 Novas Join National Nostalgic Nova! 70 Orange Cooler 69 Camaro
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#7
07-09-2020, 01:17 PM
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It may just be a bad tach filter.
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It's only Orig once, you can’t make it that again I spend a lot of money on Wine, Women and Cars, I waste all the rest.
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#9
07-10-2020, 01:33 AM
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Tach filters were late 70s. No filter on this one.
Jason
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#10
08-16-2020, 06:29 PM
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Quote:
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1970 LS6 Chevelle 1998 Viper GTS
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