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OK, but how would I wire the RA89A relay to the aquastat?

Thanks for the response. There is no T-T terminals at the burner primary control. Its a Riello 40 burner. I understand how to wire the circualtors and thermostats at the SR-503, but how do I tie the SR503 to the boiler with no T-T or ZC ZR connections on my aquastat. The following picture shows...

Hello. Im in the process of replacing my 57 year old oil boiler. I just purchased a used Weil Mclain Gold WTGO-3 Boiler with a Riello 40 burner for $500. The old boiler is on its way out and I need to replace this thing before the winter. The used WM is about 6 years old and in excellent shape...