John,
I wrote the directions for the 124. I have corresponded with Tom Pindelski, who put one in his 560SEL (a 126, I believe). He had some wiring trouble and got help from Omega, the alarm maker. He sent me the PDF for wiring, and I can email it to you, just give me an email address (bstreep@satx.rr.com). Also, if you are going to Mothers, it sounds like you are in SA or Austin. If you would like some help, I'm on the north side of SA, and I'd be glad to help. Tom also managed to wire his lights and a horn to his for audio and visual, if anyone is interested in how he did that, just email me.

Good Luck,

__________________
Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)