I totally agree with "ouch" with the literal pain in the neck, but it's also a hassle getting to the 2 screws especially with the re-installation of the screws.

To make the job of re-installation of the screws easier, I bought a screw holder that has a plastic shaft that I cut down as it was too long. Although not mandatory, I usually remove the headlight switch without removing any of the wires and the choke handle. If you opt to remove the headlight switch, it's a good idea to disconnect the battery as the power for just the headlights via the switch isn't fused. Actually, it's not a bad idea to disconnect the battery whenever doing almost any underdash repairs.

The updated gauge has the same dimensions, but is calibrated to read higher temps and the face of the gauge is also different to reflect the different range.

As the part number didn't change when Volvo updated the gauge, I've always assumed it was updated when Volvo started installing B20s in the 1969-1970 122 Volvos as they use the same water temp gauge as the 544/P210.

Since I bought the gauge from VP, I've got to go with their current price of $266.11 plus shipping. Volvo's price for the same gauge is almost $300.00!
--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com