18F2620 32mhz pll and Timer1 250ms ticks

I think i have configured my 18F2620 to run at 32mhz. Prev 8mhz and timer1 4hz ticks no problem.

Now i'm after Timer1 interrupting every 250ms with clock running at 32mhz..

Using mister e's calculator T1CON seems to need a 1/32 prescaler. But i don't see how to select that. Not listed?..

Am I missing something or is a 1/32 prescaler just not available with the 18F2620.

TMR1CS seems to suggest a 1/4 divider from fosc? I'm a bit confused..