Is it possible to hook up something to the OBD2 port that would read the RPM’s? I ask because I am trying to figure out if the tachometer is showing the true RPM’s - which I think it is not. Is there a portable tachometer that is cheap or possibly something that attaches to a usb for a laptop?

The last description sounds like the tach is needing replaced. Find out if it can be fixed before buying an instrument you might only use once. If this unknown vehicle is an older vehicle and it runs fine why even worry about the RPMS. Not all cars have RPM tachs and people use them just fine.

Its a 2001 dodge grand caravan with a 3.3L V6 engine. I am going about 60mph and when I press on the gas to go to 75 it might move from 2000 to 2200 rpm. It seems to accelerates fine

Sounds perfectly normal to me. The engine at that vehicle speed is hard-linked to the driven wheels. It will not gain RPM faster than the car gains speed, and it doesn’t have to change RPM much to get the GC from 60 to 75. And I seriously doubt if it’s going to have the poop at that speed to downs…

umm… the math. 2000 RPM at 60 MPH = 2500 at 75. close… but the OP might want to try for an accurate reading.

Here’s something for $36. [image] LCD Automotive Multimeter with Tachometer Kit This automotive multimeter allows you to measure AC/DC voltage, dwell angle and engine RPM from the comfort of your own garage. With the large easy-to-read LCD display, readings are clearly visible even in low…

“An engine analyzer will do that. Try any parts store. Bring your wallet. They’ll probably be hanging from the same rack as the lesser OBD2 scanners.” “For most other makes however you need to take Mtnbikes advice…and like he said…bring serious cashish with you. What you are getting into with that…

This is a 15 year old van, if it runs and the speedometer is reasonably correct why even worry about the RPM’s. It is not like you are going to manual shift the automatic transmission on track days.

There is an add-on engine meter that used the data port to get info. It can display lots of different things, like oil temperature. I’m pretty sure that RPM is one of those. The thing is, this is not an engine analyzer, but is designed to look good attached to your dash somewhere. But, I can’t fin…

One of the more well known multifunction displays is Linear Logic’s Scan Gauge. The hypermilers swear by it. http://www.scangauge.com/

Read RPMs from OBD2 Port?

General Discussion

Nevada_545 March 27, 2016, 4:06am 13

The tachometer reading sounds a little low. The gauges in that instrument cluster can be adjusted with the calibration feature in the DRBIII scan tool but I don’t think it is worth the effort. For less money you can buy a display that shows most of the engine values.

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Read RPMs from OBD2 Port?

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