Quick question about factory tach

[Keckdl]

My awesome wife bought me the factory reproduction tach from LMC for my birthday and I'm trying to find info before I install it. I have an 83 K10 Scottsdale with all the gauges and warning lights but no tach. I know I will have to get a new circuit board for the back, but will the tach fit in the old fuel gauge hole, and the new fuel gauge fit in the clock hole without modifying it?
If so does anyone make the or sell NOS instrument trays?

Thanks,
Dan
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