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rod123 12-27-2004, 02:46 PM I want to change my speedometer with an overlay to read 120 mph. after the overlay change from 85 mph to 120 mph can I change my speedometer transmission gears to make my speedometer read correct or do I have to have it calibirated by a speedo shop? Thanks Rod 8) XbeasleyX 12-31-2004, 03:57 PM I leave that job to the pro's. mk1264 01-02-2005, 01:22 PM You will need to take it to a shop tand have them calibrate it. Cost me $75.00 good luck. LeoC2 01-02-2005, 02:29 PM You will need to take it to a shop tand have them calibrate it. Cost me $75.00 good luck. Wouldn't it be cheaper both dollar and time wise to just buy a 120 or 140 speedo off ebay and install it? No calibration needed. mk1264 01-02-2005, 05:46 PM Maybe..... I saw a factory 120 speedo off a 78 malibu police car. The guy that calibrated my speedo had it. I dont know how much he was seling it for. But he said it was very hard to find. Elky 83 01-03-2005, 08:34 AM I picked one up off of Ebay and it worked just fine. A lot less hassel.. dave1987SS 05-19-2005, 06:47 PM Get one from a 1987-88 Monte Carlo SS, they bolt right in, and need no recalibration. Not all that rare, but expect to pay around $70-80 on ebay. I think they go up to 140. Dave | ||