In Poser 7 you can simply use erc. Which means editing the cr2 file. Place the master in the BODY section ( I put it after the normal dials xtran etc)  and add the slave part to the rotate channel for each wheel.

valueParm Master 1
    {
    name Lower Grips
    initValue 0
    hidden 0
    forceLimits 0
    min 0
    max 1
    trackingScale 0.004
    keys
        {
        static 0
        k 0 0
        }
    interpStyleLocked 0
    }

rotateY yRot
    {
    name Turn
    initValue 0
    hidden 0
    forceLimits 1
    min -170
    max 170
    trackingScale 0.001
    keys
        {
        static 0
        k 0 0
        }
    interpStyleLocked 0
    valueOpDeltaAdd
        Figure 1
        BODY:1
        Master 1
    deltaAddDelta 1
    }