Young Ed Posted November 5, 2018 Report Share Posted November 5, 2018 8 hours ago, dale said: Well for any do it yourselfer old Plymouth rodders….Took the Plymouth out this morning and going thru the speed alert in town the speedometer was right on at 30 mph... 7 tooth red drive gear and a yellow 24 tooth driven gear......350 chevy antomatic with a 3.71 rearend and 670-15 coker narrow radial tires. I'd be interested to see how you did in a clocked off mile-around here those speed alert things always seem to read 3-5MPH off of my daily drivers. Quote Link to comment Share on other sites More sharing options...
dale Posted November 5, 2018 Author Report Share Posted November 5, 2018 I go thru this one almost every day with my town and country or Tahoe and they both read right on at 30 mph... Close enough for government work ... 1 1 Quote Link to comment Share on other sites More sharing options...
martybose Posted November 8, 2018 Report Share Posted November 8, 2018 It took a while, but I found the GPS system that drives a mechanical speedometer. It probably isn't cheap (no price listed), but it certainly solves this problem. It's called the SPEEDBOX, it's sold by Speedhut on their website http://www.speedhut.com Marty Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted November 8, 2018 Report Share Posted November 8, 2018 The price listed on that web site is $345.00 Quote Link to comment Share on other sites More sharing options...
DJ194950 Posted November 8, 2018 Report Share Posted November 8, 2018 Other ratio adapters are avail- a few for your pleasure or terrorize your wallet! ?? DJ ECD-100 Electronic Signal to Mechanical Cable Drive Adaptor.htm Amazon.com PATC speedometer ratio adapter 17.6% decrease Automotive.html Ratio Adapters.html Quote Link to comment Share on other sites More sharing options...
52 work truck Posted January 4, 2019 Report Share Posted January 4, 2019 On 11/2/2018 at 7:49 AM, dale said: I don't see a beer on the table Robert !!! Im keeping the original look with the old gauges.. Classic instruments in Boyne City MI can convert your stock speedometer to GPS Quote Link to comment Share on other sites More sharing options...
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