I made a few adjustments to the Zero4K db signal scale this evening. A Dutch mixed with English thread on this subject is ongoing at OpenPLi:
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The c band dish is centered on 117w for these demonstrations.

For transponder 3925, The sf8008 shows 14.8db and the Zero4K shows 14.9db
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For transponder 3960, the SF8008 shows 12.0db and the zero4k shows 14.8 db
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Move the dish 10 clicks to the west to de-tune.
The SF8008 shows 9db on the 3960 tp and the zero4k shows 8db.
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As can be seen, the signal meters do not make much sense.