Seatbelt Interlock Question for Dr 914, Schematic for relay?? Options

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Hi gang,
My 1974 2.0L seatbelt interlock is suspect.

The car is new to me (33K original miles). The car was a 1.8 and a new 2.0 engine installed (3K miles ago) with duel weber 40s installed). The wiring and engine bay was cleaned up. The car always cranked (since it was delivered) but did not start. Since then I got it going/fixed by:

Changing the points (changed to pertronix ignightor II because the car carrier guy left the key on and melted my points and T12-5 wire which is the wire to the coil melted and I replaced).

Replaced the fuel pump (didn't work, located in the steering access area, cleaned/buzzed out the relay board, checked wiring etc..)

After replacement, he fuel pump buzzed (first time) but the starter did not engage (first time that happened).

I knew your book pretty well and I jumped pin 50 and C (on the SBIR) and the car started !! (Recently failed seatbelt interlock relay because I replaced the fuel pump??)

My questions now are:
1. Should I leave the SB Interlock relay(SBIR) in?
2. The seatbelt light never worked .. haven't check the bulb or CCA yet, could it be related to the SB Interlock relay(SBIR)?
3. E-brake light never worked.. have checked the bulb and have continunity to BRN/YEL wire to pin A (SBIR), could it be related to the SB Interlock relay?
4. Oil Pressure light never worked.. haven't check the bulb yet, could it be related to the SB Interlock relay or because I have a guage?
5. Defrost light on console never worked..haven't check the bulb (looks ok) or wires yet, could it be related to the SB Interlock relay?

I will check the bulbs and wiring soon, just wanted to get your opinion if this could be related to the SBIR.

Also the buzzer next to the SBIR works on the passenger side (i.e. buzzes when the passenger door is open and the key is on) but not the driveres side door (but the interior light works fine with both doors). The seat sensor has been connected and disconnected with no difference.

Do you have schematics of the SBIR and/or the 74 style buzzer (not in Haynes). I would rather replace a "suspect" relay (but rather not pay $52 to guess) before I pull things apart .

Thanks,
Tim