Dash caps are good and bad... The bad is that if you don't secure them with enough velcro it will buzz and rattle and generally detract from your mental health... unless you really like stuff like that. The good is that they are available and generally look pretty good if you use enough velcro. If you think of securing the dash cap with silicone it won't stay secured. (recipient of a car that the PO did that - 240D) The silicone just makes a mess. I like velcro because you can remove the dash cap if you have to. If it is glued in place you can't remove it.

Velcro should be applied across the dash in long strips. Also in at the front side (windshield side) of the defroster vents. Since you are using velcro you can remove and replace the dash cap while you are measuring the proper location for the heating / cooling sensor in a W123.

After you get the hole made in the dash (measure 2x, 3x - cut once) insert a used sensor grille that you have ground down so only a small stem actually protrudes through the dash cap.

Note: The current sensor unit is not long enough to span the distance between the top surface of the dash cap and the bottom of the dash cover (old dashboard). Thus the need for the cosmetic, but functional top grille. You can get an old sensor grille at your local PNP. Even if you don't get the sensor hole exactly in the right place, it will function.

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Pete Williams, President emeritus - MBCA-International Stars (Eastern Mich.) Now Wi. & Az.
1985 300D Manual 4 speed Green Hen's tooth
1979 MGB triple black Az car nice
1969 back 1/2 of MGB (Az home built trailer)
1991 Volvo 245 Wagon Nice AZ Restored Gold Brick
1983 Jeep CJ7 37,600 Miles Summer use only