[Fot] TR3 timing cover bolt threads

[Randall]

> I am using a mechanical Auto Meter
> water temperature gauge and need to know what those threads are in the
> thermostat housing where the stock temperature bulb (sending unit TR4)
> screws in.

You might want to test fit your gauge, Greg.  As I recall, the TR4 housing
will accept the original TR3 mechanical gauge, and my Sun mechanical temp
gauge fits into a TR3 housing perfectly.

Randall