1987 560sl trouble shooting

[metadanny]

hi all,

i recently sold my 1988 porsche 944 turbo and replaced it with a 103xxx mile 1987 560sl. i've always loved how these cars look and really appreciate mid 80's mercedes build quality.

i bought my 560sl as a non runner with a cracked oil pan and worn engine mounts. i had my mechanic replace the following:
- oil pan
- oil pan gasket
- engine mounts
- all the belts
- A/T Filter & Pan Gasket
- Air Filter
- Fuel Filter
- Oil Filter
- Power Steering Filter
- and all the fluids

the car runs great, really smooth power and balance, i love it!

i'm trouble shooting a few minor problems, so far i've fixed the sticking roof latch mechanism but am stumped by:
- inoperative tach, it doesn't even flicker when i turn the ignition on
- inoperative coolant temp gauge, the needle flickers slightly when i turn the car on but stays dead otherwise

i've checked the fuses, they looked good but i still took the relevant ones out and replaced them with out any success on the above problems.

any thoughts on where should i look next?

thanks!

danny

[petesmga]

install a ground wire to the back of the cluster.

[metadanny]

thanks petesmga! installing a ground wire fixed the temp gauge.

the tach is getting power but not working, looks like i need a replacement tach.