Paul, I do believe your TR4 should have a right-angle drive. Speedo cables
do not work well around sharp corners, and there's a very good chance the
corner is the source of both the varying reading and the short life. The
drives aren't cheap (ISTR around $50 but don't quote me on that), but it's
the right way to do it. Available from the usual suspects.
TR2/3s didn't use a right angle adapter, but they had a special cut in the
trans tunnel and the floor to allow the cable to exit straight and make only
a very gentle curve.
Randall
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