Specmo speedo calibrator Question

[pauls]

I've got a 12 yr old Specmo RB 2120 in my GTS to calibrate the speedo for my 3.55 gears. I had to put the 3.07s back in while I refresh the 3.55 diff. Without removing the calibrator how do you get it to get the right speedo reading for the stock 3.07s? I called their tech line and they say the closest it can get for 3.07 without disconnecting is a 0.0397 off by flipping all the dip switchs off. Anybody deal with this issue before?

 

[JonB]

Long Ago, 'all switches off' gets you as close to stock as possible. Got a GPS? Thats the way to check...

 

[pauls]

Thanks Jon, tech says that gives me the 0.0397 if I solder the link back up that you cut . You'd think you turn it off and it goes to Zero. They want me to cut the wires to get back to stock.