Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) 3.7 l Roadster advice please

on a plus 4, the speedo can be recalibrated. Keep the trip recorder button under the dash depressed whilst starting the engine and a code will appear in the mileometer. as each digit flashes, it can be changed by multiple presses of the reset button and will finally revert to normal mileage reading. think a plus 4 was something like 008386, but guess codes vary for different models. Don’t know how much the number needs to be changed to achieve a significant alteration though but others might?
Also, if the speedo is difficult to read with tonneau in place, why not swap positions of rev counter and speedo. (unless you are always driving to the red line!) I am told that the wiring is usually long enough to do that.

http://www.talkmorgan.com/ubbthreads.php/topics/154911/re-calibrating-speedo

^^VDO unit

The Mustang forum suggests reflashing the PCM. I will let Bell & Covill figure that out with MMC as they sold me an illegal car.
Meanwhile I have a cheap GPS speedo to help

I purchased a sat nav for touring around Cornwall, the added benefit being it had a speedo, although as stated earlier, I am not wholly convinced it is accurate - going by road side speed warning displays.

It is also a bit too much hassle for every day trips.

I did think about adding a digital readout that connected to the ODB port, is this worth it though? Would the data from the ODB port be more accurate?

Appreciate any guidance.

Steve

My tom tom seems to match closely with my speedo and most roadside signs.

I totally rely on my Tomtom and find it shows all three cars to be over reading by + 5mph, the variable Motorway speed limits agree with it so I'm assuming it's pretty accurate.
It's kept me safe from the revenue collectors since 1991 so somethings working, the best £90 I ever spent.

Adrian's thread on the PCM (ECU) development leading to the one you have John is here. You will note there is specific reference to trip and speedometer anomalies!

I have a GPS Speedo on the steering column. It agrees with roadside signs all the time and reads around the same as the speedo.

If you use self adhesive velcro on the steering column behind the dashboard and fabricate a bracket from an old tupperware box, you can make quite a neat unobtrusive fastening that is easy to remove when the time comes for the car to be sold. I power it from a USB socket fitted in the radio blanking plate.

Steve, that's what mine is, if you look earlier in the tread there's some photos

Cheers for the pointer Jon.

I was looking at something similar on the web before I went the Sat Nav route but that does look a little simpler,

How visible is the readout in bright light?

Steve