kph in a 240Z?

[Doehring]

Guus,

my 240z has an mph speedo. I also got a 26oZ speedo in km/h.

Their sizes ares identical, but not the way they are fixed to the dash and also the plugs/wirering is different. I would not try to change the speedo exept taking out the dash for easy access.

What I did: At first I drove the car as exactly as possible for exactly 1 km at speedo showing 2o mph,30 mph, 50 mph and stopped the seconds I needed. Then I calculated the km/h at these figures. My speedo seems to be quite exact. In average I had to multiply the mph figure by 1,65 to get the "calibrated" km/h figure. I took a transparent adhesive foil and cut it to the silhouette of the speedo's glas. On that foil I marked little dots there where the speedo showed every 10 mph when I look at it normally sitting in my driver's seat. I took out the foil and pressed letra-set figures on it,

showing the matching km/h. 0 = 0, 20mph = 33 km/h, 30mph = 50 km/h, 60mph = 100 km/h, 80 mph = 130 kmh, 110 mph = 180 km/h. 140 mph = 230 km/h.

I finally fixed the foil on the glas. It works sufficient. I never had a problem with radar or laser guns because of wrong reading. The police normally accepts little tolerances and nearly every speedo has tolerances.

Rolf

[Z-point]

I’ll agree to that. In my US imported car was mph speedo as well, I change it into a kph speedo. But its sort of accurate (10kph different) around the 100 /140 kph. I tested with two cars. But above that with high speeds it’s ‘dancing’, in no time I drive 210????

I think I’ve to check the kph speedo, or change it with a 260Z?

[zorro]

High Zed Rally, it sounds as though you have replaced your MPH speedo is that how you know it will work?

[Zedrally]

Yes, I've replaced it.

Now before anyone asks, I'm not exactly what it came out of as I simply asked my mecanic if it could be done, to wit he answered yes and handed me the speedo.

Now I also have a 260 and they appear the same [from memory]. I'll take a photo tonight of both and post it tomorrow.