Adam, the circuit layouts are the same, but the resistors are different. Are the "windings" the same? What I'm getting at is, could a dummy gauge be converted to real gauge by swapping the resistors (similar to the method for converting the temp gauge to a linear gauge)?
Also, thanks for the technical info!
Active: 1991 Mazda Miata (B-Package), JRSC+MS3 [Daily/Project]
Active: 1995 Mazda Miata (M-Edition) [Full Send Project]
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Hiatus: 1958 Volvo 444 Sport w/ Ford 2.9L EFI and drivetrain
What are the differences in the sending units, and if so, how do you tell them apart?
The NA6 sending unit is HUGE. It sends out varying resistance throughout the pressure range.Originally Posted by Satisaii
The NA8 is just a switch that's set at 8 psi (I think) and is comparatively tiny. When it reads below the set pressure, the switch closes and grounds the gauge, making it drop to zero.
As far as I know, the windings are backwards. Watch the video and see the behavior of the gauges when power is applied. They seem to be backwards from each other.
The NA8 also has damping grease.
So... in theory, you could convert one gauge to the other by rewinding it, removing the grease, and changing resistors. OR you could take advantage of the cheap and plentiful NA6 gauges (they're usually around $20 each) and save yourself a ton of time.
The expensive item is the NA6 sensor. You can still buy them new, but they're rather not-cheap and I'd personally not trust a used one.
jnshk (03-18-2014)
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