[Spridgets] 5-speed speedo drive question.

[Peter Shull]

What I know: Paul A had the speedometer angle drives and cables for his Datsun 5-speed conversion kits made at:

Speedometer Service and Instrument Company
3551 NW Front Avenue
Portland OR 97210-1301
(503) 227-5567

For Morris Minors the conversion speedometer cable was modeled after those found on FWD Datsun F10s.

What I do NOT know: The formula he used to derive the ratio at which the angle drive was geared (he stamped this information on the body of the angle drives he supplied ... 1:1 to 1, 1:3 to 1, etc.). The formula was derived from tire size, etc., and the angle drive ration was made to correlate with information that is in the fine print found at the bottom of a Smith or Jaeger Speedometer. This allowed the use of the original speedo without having to change its internal gearing. The finished product usually gave a good approximation of the car's speed but was not precise, He considered this information proprietary and I was not privy to it. 

Pete

Previously, Bill M wrote:

Paul had some units when I bought his stuff but he had NO records about wherehe had gotten them so I have no more- as far as I know Rivergate is the onlyplace right now.I have referred a few of my friends to get the Rivergate units and they arethe least expensive and best fitting units that I know about.
BillM