speedomter not working

i got a 86 se 2m6 4speed

so my speedomter is not working and either are the dash lights

but the tach work and the back light for it

but everything workis in the rain or snow

i cleand the grounds that coming off the battery to the block ... didnt do anythig

replaced the speedomter senser....... nothing happend

tryed to traced the ground from the dash........ couldnt find it

so i have no idea whats going on :banghead:

any one have any idea?

or where the ground is for the dash?

no body knows where the dash ground is located???

so not a single person here knows where the ground is or anything that could be going wrong?

Hello
If you give me until tomorrow. I will have time to search my shop manual.

Regards
cubano112266

alrite, awsome thanks dude