Tach was 'free' with a 4-speed in '69, an option in an auto.
Was an option in both for '70 because they fitted the 4-speed cars with a rev-limiter.
Unbelieveable thing was you could go from a 'CJ to a SCJ in early '69 for about $6 for the optional axle ratio - it triggered the SCJ crank, LeMans rods, cookie cutter spacer, bigger harmonic balancer, speedo adapter, oil cooler, horn jumper wire and different timing pointer - until about mid Feb '69 when they said "Fcuk that - surely we can charge more! How's $121-odd sound? Let's give it a NAME - surely that'll reel in the suckers! DRAGPACK sounds good...."