Tach differences 1.6 vs 2.0

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nismou20
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Tach differences 1.6 vs 2.0

Post by nismou20 »

So I’m assuming that the left tach is a 1600 and right one is a 68 exclusive 2.0. The big number increments do not match the positions on face due to rear ended ratios 3.70 vs3.90. But did the 1.6 tach ever come without a 0 position pin stop? The face at 0 mile on left looks to never have had one. But it does rest where it is on left way below 0 mile mark. My original 2.0 doesn’t have a 0 stop pin either. Curious.
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SLOroadster
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Re: Tach differences 1.6 vs 2.0

Post by SLOroadster »

The white faced gauge is a repainted 2L. The bottom gauge in the right photo is a 1600 (only goes to 7K) and the upper one is a 2L.

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Re: Tach differences 1.6 vs 2.0

Post by Toptech360 »

Differential ratios do not affect engine rpm at tachometer. On our cars it's measured off a cable attached to the distributor.
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nismou20
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Re: Tach differences 1.6 vs 2.0

Post by nismou20 »

Well, that’s what I originally thought but the locations of speed increments are positioned differently on the 2 tachs. If I swapped between the 2 tachs the speed indication would be different no? Also my biggest curiosity was the 1600 without a 0 mile stop pin. There isn’t one and the needle sits way down by turn signal lt. is this normal on some 1600s. Or should they all have a 0 mile stop pin?
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Re: Tach differences 1.6 vs 2.0

Post by Toptech360 »

Someone should know! I do not though. It would be possible to test both tachs and compare them to a service tach or timing light that shows rpms.
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Re: Tach differences 1.6 vs 2.0

Post by ppeters914 »

I think you mean 0 RPM not 0 MILE when referring to a tachometer.
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Re: Tach differences 1.6 vs 2.0

Post by theunz »

The tachometer’s internal gearing is probably different so the seeep can take up the same number of degrees on the face. They should work correctly for either engine.
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Re: Tach differences 1.6 vs 2.0

Post by caraddict »

Calibration is exactly the same on both units. (You can put a 7K tach into a car that had an 8K tach or vice versa and it would read correctly)
There should be a pin in the dial for zero indication so the unit you are showing probably has a broken pin. Calibration would likely still be good but unless the tach had a major failure where the pointer spun around and broke the pointer.

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Re: Tach differences 1.6 vs 2.0

Post by mraitch »

Only the speedometer/odometer is affected by variances in wheels, tires, differential etc.
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