Good day all, I have a question regarding the circuit board on the Speedo/Tach. I did search the forums and found a couple of topics but no answers. I wish to replace the speedo with a 140MPH and currently have the Canadian version of the 80MPH/140KPH, my question is are the circuit boards the same or are the Canadian boards calibrated to the KPH that we use?

Thanks in advance

T

80STROKER38967.3659027778

I think the difference in the(fact.) kpm/mph speedos is just the printing on the face, and possibly the speedo gears themselves? Not really sure...
If you change to a higher range speedo, there may be a different board required, or maybe just a different resitor/shunt in the system.
If you have a supplier for the new speedo, you might need to ask if there are other mods/parts needed.

In a 1980?  Look close.   The speed is still cable driven.  The printed circuit board should not have any affect on the speed reading.  The difference is the calibration of the speedo head ( mechanical ) and the different face.

Some California speedos have a VSS, vehicle speed sensor, and all 81 have  the VSS as part of the speedo assy.  So the head is different but the calibration is still mechanical.

Wow!! Good catch on that one, Ken!

My '78 came with a metric speedometer. I swapped it out with a 140 mph speedo head and used the same printed circuit...no problem at all. I do think the speedometer reads a bit higher than is accurate, but not a lot. The tires are one size undersized (P245/60R-15 instead of P255/60R-15)), which may account for that. The tires were new on the car when I purchased it so I'm not going to spend for a new set just because of that.

Thanks a bunch guys for the info. Much Appreciated  

T

[QUOTE=kstyer]

In a 1980?  Look close.   The speed is still cable driven.  The printed circuit board should not have any affect on the speed reading.  The difference is the calibration of the speedo head ( mechanical ) and the different face.

Some California speedos have a VSS, vehicle speed sensor, and all 81 have  the VSS as part of the speedo assy.  So the head is different but the calibration is still mechanical.

[/QUOTE]

Therefore, if you install a "normal"(not metrical) speedo head, it should be properly calibrated...

The 81-82's had 'lectrical speedos for the lock-up convertor to work. It needs a valid speed signal. The Calli cars got the 350lu in '79 or 80.

Thanks guys, you da bomb   

T